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It sounds like you’re experiencing cross-contamination of your GA4 data. This is often a result of mistakenly sending the data from one website to another analytics property. Since you’re using Google Tag Manager, check that each property ID is correctly assigned in each GTM container. This would be the first thing I’d look at given that you’ve mentioned the issue still persists even when creating new properties. You might also want to consider using separate GTM containers for each of your websites to better manage the tags and analytics related to each specific site. This can also make debugging easier if you face any problems in the future.
