This is usually a symptom of GA data being sent directly to the GA rather than to the server container. This is usually due to one of three possibilities:
- you have not set the server_container_url with your container url
- you have multiple google tags in your container with different settings
- you have an active third-party GA4 integration that overrides your settings in GTM
- you have gtag inline code that overrides your settings in GTM
This article is related to another GA4 issue, but it describes how you can check if you are sending events directly to GA and how you can fix this.