Sometimes the first visit goes to

Since some days i can see that sometimes (not often, but i didnt see it so often before) that the first page view goes to instead of my stape server url. The GA4 tag is firing on init. and serever url is configured in ga4 config tag and in event settings too. Any idea what that could be?

And on purchase events i see sometimes analytics/privacy sandbox in network tab in dev console ?!

This can happen if you have the same GA4 additionally initialised elsewhere, but without server_container_url. It can be in the code, through some integration or plugin, etc.
It can also happen if you use several GA4s in parallel, e.g. one via web and one via server - it is not recommended to do this.