The question Why do flights sometimes share the same flight numbers? was closed by one moderator as unclear. The question hadn't received any other close vote.. No comment were left by the moderator. That shouldn't be happening as 1. This doesn't give the OP a chance to keep the question open 2. The OP doesn't understand what was unclear in the moderator's mind 3. This was a hot network question and closing the question removed it from the hot network question list, thereby losing potential answers.
I'd also note that the question hadn't received in any unanswered question in the comment section, and that the question received two clear answers by the time the question was closed.
Please moderate more mindfully.