Celestial Tournament boss switch?

[zimboombafoo]

I've been working on An Awfully Big Adventure and the only trainers I have left are the bosses of the Celestial Tournament...Strangly, yesterday I was working on 3 of them..went outside to res my pets and came back in and the bosses had changed completely. (This was after the server reset, so it couldn't have been due to that..plus I had already done the Tournament last week). I thought the bosses stayed all week and didn't switch until the next week? What gives? Thanks