Happens with everyone who uses Utopian. I talked to the founder about it and he said they'll discontinue. It is a declared thing. Terms of usage.
Whenever Utopian bot votes on an accepted contribution, 15-25 % from the author share of rewards (that is 75 % of total amount) goes to Utopian to pay their team.
My post on Reputation Score finalized at $358 but I got only $300. Despite getting a repeat, bigger vote from Utopian, I was in loss. They will drop this practice soon.