I Used to Think Tracking Was a "Set It and Forget It" Job

For the first two years I ran Google Ads campaigns, I set up conversion tracking once and never looked at it again. Tags went in, conversions showed up in the dashboard, and I made bidding decisions based on those numbers. It worked fine. Until it didn't.

Last August, a client's Google Ads account showed 47 conversions in a week. Their CRM showed 19 actual leads. We'd been making budget decisions based on inflated numbers for almost a month. The Google Ads conversion tag was firing on a page that users could reach without actually submitting the form (the URL was accessible via a direct link in old marketing emails). That's when I realized google ads conversion tracking issues aren't rare edge cases. They're everywhere.

The Most Common Google Ads Conversion Tracking Issues

After auditing about 30 accounts over the last year, I've found that roughly 40% have at least one tracking problem. Here are the ones that show up most often:

Tag fires on page load instead of form submission. If your conversion tag fires when the thank-you page loads (and that page is accessible without completing the form), you'll count false conversions. I've seen this in at least a dozen accounts.

Duplicate tags. One tag installed through Google Tag Manager and another hard-coded in the page header. Every real conversion counts twice. Your cost-per-conversion looks half of what it actually is.

Conversion window mismatches. If your conversion action is set to a 90-day click-through window but your typical sales cycle is 3 days, you're attributing conversions to clicks that had nothing to do with the purchase.

Enhanced conversions misconfigured. Google's enhanced conversions feature requires hashed first-party data (email, phone, address). If the hashing is wrong or the data fields are empty, enhanced conversions report as successful in the interface but don't actually improve matching. Misleading, not helpful.

How I Check for Tracking Issues Now

I've built this into my monthly routine for every account I manage:

  • Compare Google Ads reported conversions against actual CRM or e-commerce data for the same period. If the numbers are off by more than 10%, investigate
  • Use Google Tag Assistant to walk through the conversion flow and verify tags fire only where they should
  • Check the conversion action settings in Google Ads. Verify the count setting ("one" for leads, "every" for purchases), the window, and the attribution model
  • Test the conversion path on an incognito browser to avoid cookie contamination from testing

This takes about 30 minutes per account. I find issues roughly every third time I run it.

Why Smart Bidding Makes This Worse

Google's smart bidding strategies (Target CPA, Target ROAS, Maximize Conversions) rely entirely on your conversion data to make bidding decisions. If your tracking is overcounting conversions, smart bidding thinks your campaigns are performing better than they are. It'll bid aggressively on audiences and placements that aren't actually converting. You end up spending more for worse results, and the dashboard looks great the whole time.

I changed my mind about "set it and forget it" tracking because the cost of bad data compounds. One week of inflated conversion counts might not hurt. A month of it trains Google's algorithm on garbage signals, and it takes weeks of clean data to retrain it.

Your Tracking Is Part of Your Ad Spend Protection

Google ads conversion tracking issues aren't a technical footnote. They're a budget problem. Every dollar you spend on ads is guided by your conversion data. If that data is wrong, your spending decisions are wrong.

We monitor conversion tag health continuously with FunnelLeaks because tracking breaks when you least expect it. A site redesign, a GTM container update, a new cookie consent banner: all of these can silently break your conversion tracking. The sooner you catch it, the less budget you waste on bad signals. Set up monitoring here and stop guessing whether your numbers are real.