@octavioamu can you provide some information that might help rule a few things out? What you are describing with the user switching sounds like a much larger issue.
- Did you follow our official guide to install Discourse?
- What Discourse version are you running?
- Do you have any custom plugins installed?
- Are you using any kind of sso/external authentication
It almost sounds like you are somehow being logged into another non-staff user’s account when navigating to the review queue and the “Oops!” page is hit since they don’t have the appropriate permissions. If that is the case, there is something very concerning going on with your site. Does this “other user’s avatar” change happen in other contexts or only when trying to view the review queue?