
Hi @Wilson, John ,
Thank you for posting in this community.
After deleting, it still shows that the user is in the member group, is it the group that comes with the site when it is created(site owner /site members /site visitors)?
Additionally, you can check if a user still exists in a group in the Sharepoint Admin Center.
If you still don't see the user here, a combination of checks done in between can determine that it's a sync delay issue. I've been in the same situation as you before, be patient and wait a few days to get back to normal, don't worry.
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