How does the plugin match identity? I presume that if a user is logged in, it matches that user_ID with the local avatar photo that this user has uploaded.
I have a strange bug where two particular users, who both use the same computer, log in and one of the users' photo gets used for both of their identities (comments & posts), but in the admin and on the front end.
If they switch and the other logs in, then the other photo gets used for both.
The two users have different registered email addresses and username, obviously. I can't figure this out. It appears that they are the only two users where this is happening.