You are spending too much time over meaningless newbie alt accounts who spam bounties, altcoin board is full of them. You can't fight this, once you tag one account two new accounts pop in, they are like bloody mushrooms.
There might have multiple reason for creating a new account and post by them:
1. Previous account banned
2. Got negative trust on previous account
3. Do not want to let anyone know about his/her real account as the person is not sure about the accusation. There might have more reason.
Maybe huge brick fell on OP's PC, it caused short circuit, whole room burned together with their login details?