Matomo Conversion Export under-reporting conversions

We switched from Google Ads conversion tracking & GA4 to using Matomo conversion exports into Google Ads. We’re finding that when we compare the numbers, the Matomo conversion exports are about 25-30% lower than the Google numbers.

Both matomo conversion exports and Google Ads conversion tracker are using a 90 conversion window.

What might be causing this?

HI @adamtss ,

Could you please get in touch with our support team at