I'm more thinking if it was for revenge. Sadly some staff use there power to punish players simply because they don't like them. This is most likely not the case because as far as I know Julius didn't know Nadine or Basi, and most of the time when using a ban to punish a player they don't like they use "harrassing a staff member" as the reason.

Perhaps more specific reasons are needed, or they could try contacting the player to make sure it's not just a error.