The only Enabled admin side setting I can find along those lines is “Disable user cards, user profiles and user directory for anonymous users.” so only those who are logged in can see a profile.
Is it possible you may have inadvertently changed that setting sometime? I can see a lot of action logs but doesn’t look like profile settings are logged (long enough for me to look this up anyway) @Mosaic_Co-Labs - also see if flipping that option works for you and maybe DM a few of the users and see if it was a conscious change or not.