I’m not sure if it’s related, but applying the patch to the user search fixed most of our current problems.
Since I have multiple roles, we use multiple languages, have multiple journals sharing registered reviewers (the researchers, not necessarily the registered user), that may have something to do with what we see when assigning reviewers;
I haven’t noticed this behavior anymore lately.
We are currently on OJS 3.3.0.8 with the patch applied to user search, available here: