Looks like another person posted in the same community as you did at similar time... https://lemmy.ml/post/1630209
Lemmy Support
Support / questions about Lemmy.
I also noticed the Lemmy user interface is now in Italian (I'm in Italy) despite having set it to English.
I have the same problem this morning. Using Safari on macOS.
I noticed that you don't even need to close the tab. You're just signed out after a few minutes.
Maybe this is intentional to free up resources? (Not that it would free up resources to delete the sessions on server and have the users re-authenticate every few minutes, but I see why someone would have thought so.)
That's definitely a possibility, but it doesn't explain why the language setting is ignored (assuming the issue is related).
Never mind, the user interface language is back to English.
Having the same problem on Firefox on Android right now.