Google Ads Conversion Tracking Problems: How to Find and Fix the Errors That Mislead Smart Bidding

The order I use to audit Google Ads conversion tracking

With Smart Bidding, conversion data is the steering wheel: if the wrong actions count, the algorithm buys more of the wrong thing. That is why I check tracking before keywords or bids, especially when an account shows clicks but no leads or a sudden jump in cost per lead. I follow the same sequence every time:

1. Inventory: open Goals > Conversions > Summary and list every conversion action, its source (Google tag, GA4 import, phone calls, import from clicks), status, counting setting and whether it is primary or secondary.
2. Primary vs secondary: confirm only real business outcomes are primary.
3. Duplicates: look for two actions measuring the same event (for example, a native form tag and a GA4 "generate_lead" import).
4. Live testing: submit forms, click phone numbers and complete bookings while running Tag Assistant and GTM Preview.
5. Calls: check call extensions, website call conversions and minimum call length.
6. Data quality layers: Enhanced Conversions, consent mode and offline imports.
7. Reconciliation: compare a recent 30-day window in Google Ads against the CRM or lead sheet.

The sections below walk through what goes wrong at each step and how to fix it.

Why is Google Ads double counting conversions?

Double counting is the most common problem I find. It usually has one of these causes:

• Native tag plus GA4 import, both primary. A Google Ads form-submit tag and an imported GA4 key event fire for the same submission, and both count toward "Conversions".
• The tag is installed twice. Once hard-coded by a developer or plugin, once in GTM. Tag Assistant will show the same conversion ID and label firing twice.
• Counting set to "Every" for leads. For lead generation, counting should almost always be One per click. "Every" is meant for purchases.
• Thank-you page reloads. A visitor refreshes or bookmarks the confirmation page, and the tag fires again.
• Multiple steps tracked as separate primary goals. For example, "form start", "form submit" and "booking confirmed" all set as primary for the same person.

How to fix it: choose one source of truth for each action. For most lead-gen accounts I prefer the native Google Ads tag (via GTM) as the primary lead conversion, because it supports Enhanced Conversions directly and attributes cleanly to the click. Keep the GA4 import as secondary for reference, or remove it. Switch lead actions to "One" counting.

Are the wrong conversions set as primary?

Primary actions are what Smart Bidding optimizes toward and what shows in the "Conversions" column. Secondary actions are only observed in "All conv." This one setting causes a lot of damage when it is wrong.

Common examples of actions that should not be primary for a local-service business:

• Page views of the contact page
• Scroll depth or engaged sessions imported from GA4
• Clicks on an email link or a "Get Directions" button
• Auto-created actions such as "Local actions" or store visits, unless you have deliberately chosen them
• Chat widget opens (as opposed to a chat that produces contact details)

Also check the campaign-level goal settings. A campaign can be set to use account-default goals or a specific set. I regularly find campaigns optimizing toward a goal that was added months ago for testing and never removed.

A simple rule: if you would not be happy paying your target cost per lead for that action, it should not be primary.

Form and thank-you page tracking issues

Forms break tracking in quiet ways. The typical problems:

• No real thank-you page. Many form builders show an inline success message without a URL change, so a "Page View contains /thank-you" trigger never fires.
• The thank-you page is reachable without submitting. It is linked in the menu, indexed by Google or shared in emails, so visits get counted as leads.
• Form submission triggers that fire on failed submits. GTM's built-in form trigger can fire even when validation fails, unless "Check Validation" is enabled and the form actually supports it.
• Embedded forms in iframes (some scheduling and CRM forms) that GTM on your site cannot see.

Better options, in order of reliability:

1. A dataLayer.push event fired by the form's own success callback (many form plugins and CRMs support this).
2. A unique thank-you URL that is set to noindex, not linked anywhere, and only reached via a successful submit.
3. An element visibility trigger on the success message, as a fallback.

For iframed booking tools, check whether the vendor offers a native Google Ads integration or posts a message to the parent page you can listen for.

How to track phone calls correctly in Google Ads

For home services, legal and healthcare, calls are often the majority of leads. Yet I often see accounts tracking only forms. There are three distinct call sources, and each needs its own setup:

My usual approach: make calls from ads and website calls with a sensible minimum duration primary, and keep click-to-call taps as secondary. A tap tells you intent, not a conversation. If you use a third-party call tracking platform, import qualified calls through its Google Ads integration and avoid also counting the same calls through Google's forwarding numbers.

Enhanced Conversions and consent mode: the gaps they close

Enhanced Conversions for leads sends hashed first-party data (email, phone) with the conversion. It improves match rates when cookies are blocked or the person switches devices, and it is also the foundation for importing offline outcomes without relying only on the GCLID. Check the diagnostics in the conversion action: if it reports that user-provided data is not being detected, your GTM variable is probably pointing at the wrong field or reading it after the form clears.

Consent mode v2 matters if you have visitors in the EEA or UK, or if you run a consent banner for any reason. Without it, Google receives no signal from people who decline cookies, and you lose modeled conversions. Check that:

• Your consent banner sets default consent states before any Google tags fire.
• The ad_user_data and ad_personalization parameters are included, not just ad_storage and analytics_storage.
• The banner actually updates consent when someone accepts, which you can see in Tag Assistant's consent tab.

A banner that blocks all tags until consent, with no consent mode signals, is a frequent reason accounts show far fewer conversions than they really get.

Offline conversion imports: tracking what happens after the lead

Even perfect form and call tracking only tells Google that someone made contact. It does not say whether they booked, showed up or paid. That is why so many accounts end up optimizing toward low-quality leads.

Offline conversion import closes that loop. The basic setup:

1. Capture the GCLID (and ideally GBRAID/WBRAID) in a hidden form field and store it in your CRM with the lead.
2. Create conversion actions for later stages, for example "Qualified lead" and "Job booked".
3. Upload those stages from the CRM, either via a native integration, scheduled upload or Zapier-style connector, ideally within a few days of the event.
4. Once volume is consistent, consider making the qualified stage primary so Smart Bidding optimizes toward it.

Enhanced Conversions for leads lets you match uploads using hashed email or phone as well, which helps when the GCLID was not captured. Watch the upload diagnostics for rejected rows; expired or malformed click IDs are common.

How to verify tracking with Tag Assistant and GTM Preview

Never assume a conversion works because the status says "Recording conversions". Test it.

1. Open GTM Preview (or Tag Assistant at tagassistant.google.com) and connect to your site.
2. Complete the real action: submit the form with test details, click the phone number, finish a booking.
3. In the GTM debug pane, confirm the conversion tag fired once, on the right event, and not on page load.
4. In Tag Assistant, check the Google Ads hit shows the correct conversion ID and label, and that user-provided data is present if Enhanced Conversions is on.
5. Reload the thank-you page and confirm the tag does not fire again (or that your logic prevents it).
6. Check the consent state shown for the hit.
7. Within a day or two, compare test submissions with what appears in Google Ads (segment by conversion action).

Then do the reconciliation: pick 30 days, count real leads in the CRM that came from Google Ads, and compare to primary conversions. A small gap is normal because of attribution windows and consent. A large gap in either direction means something is still wrong.

When to get a second pair of eyes

If you have worked through this and the numbers still do not line up, or you are not sure which actions should drive bidding, a structured audit is usually faster than trial and error. I cover this as part of my conversion tracking setup and audit service, and you can see how a rebuild is approached in the case studies. If you would like me to look at your account, you can request a tracking review.