: Google analytics reports a higher number of conversions than the a/b test (Google optimize) does for the same period I'm running an A/B test on a website that uses a goal completion as the

@BetL925

Web tracking is inaccurate. Stats from different trackers almost never match exactly. There could be many reasons why:


One of the trackers is removing duplicates
Bot traffic often inflates tracker numbers, one of the two may be doing a better job of filtering it out
They have different definitions of sessions but record only one conversion per session.
One of the trackers takes longer to load, so some users aren't hitting it because the leave the page before the tracking happens
Users more commonly block one of the trackers than the other with browser privacy extensions or ad blockers.
One of the trackers servers went down for a bit, or lost some data
The tracking happen at different stages and users get lost in between. For example if you run advertising, the number of clicks the advertiser says they sent is almost always higher than the number you observe on your server. Some of that could be advertiser fraud, but users often click on something and then use the back button before it finishes loading.

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