Hello @Piotr and welcome back to the Community!
There is currently no way to manually adjust the behavior of “How They Found You” profile tracking. However, there is an important distinction to be made between “How They Found You” values. If you use Klaviyo to automatically add Google Analytics tracking to links within a campaign or flow email, you will see utm_source, utm_medium, and utm_campaign values in addition to the standard Source, Campaign and Medium values.
These values and their differences are explained in this Help Center Article, which could explain why you’re seeing discrepancies in Google Analytics:
How They Found You
Although it’s not currently possible to edit these values manually to adjust the continuity, that product feature has been requested many times to our Product Team for future consideration.
I hope this helps and thank you for joining the Community!
-Brian