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It sounds like the problem could be arising from setting up the Google Tag Manager (GTM) incorrectly for your properties. In GA4, each property should have its own distinct ‘Measurement ID’, which should be used in your GTM tag for each corresponding website. If you are using the same GTM container for all properties, you may be inadvertently firing all tags across all sites, which would cause all properties to record all the data, regardless of origin. To negate this issue, ensure each property tag in your GTM is triggering only on its assigned domain. Adding a new domain in the data flow tab or creating new properties won’t solve this problem if the underlying issue is with your GTM setup. Check your GTM container and the firing rules for your GA4 tags. It’s crucial to ensure that each tag is assigned to fire only on the appropriate domain.
