Check on the server GA4 tag to see if you have ‘true’ for the ‘redact ip’ option?
Also, are you using your own CDN or same origin match for your sGTM subdomain? If you do, check if you add the header ‘X-From-Cdn’ as specified here:
https://help.stape.io/hc/en-us/articles/12348841204125-How-to-use-Own-CDN-on-Stape
