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.
Having the same problem on Firefox on Android right now.
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.