@Mirco_Fischer - ah good thought. Yes, I believe that is the issue (did some light testing on my end). I’m guessing this has something to do with comment stories (and presumably stories associated with those comments) being deletable by the comment author.
I don’t necessarily agree that it’s a “bug” (unexpected behavior) in that context, but can definitely see how it’s a frustrating “feature”. You could consider giving this thread a vote, but I’m not totally sure if that would address this case (since it seems to be tied to comment authorship).