User: abrasion, access, ceramium and eyelid

I have no clue what's going on with the users abrasion, access, ceramium and eyelid, but to me it looks like they are all the same users, and all trying to logon for days now.

Are they bot's or a bug?

 

I'm not sure if they're bots, but as long as they don't spam around, it's ok (I think).