These accounts are all from the same guy. He just created them and used them all to enter Open Mic Week 87 and upvoted himself with all his accounts. That kind of behavior is unacceptable and he is banned for good from playing Open Mic:

Hive account@clodovea
Hive account@rollingbottles
Hive account@upmey
Hive account@montana-msc
Hive account@ghost-7
Hive account@water-up

I just thought I would give you a heads up in case he came over here and tries to scam your contest.