Hi, sometimes when I enter a sentence discussion there are comments that I have never seen before but have been rated by my account (red / green arrow). It even happens in new lessons where it is impossible that I have entered the discussion ever before. So it cannot be explained by a partial memory loss of myself. ;) I didn't find anything about this in the forum. Has aynone else experienced this before?
That is interesting. You should submit a bug report: https://support.duolingo.com/hc/en-us/requests/new