Mixing level

Are we mixing levels in chiampionship now? We have 4 level 19 the rest of us are 18 is that normal?
There's usually not an even number of players at certain ranks, so you will get a little mixing here and there, especially at the upper levels.
First time that happened
Maybe for you. I've had guild mates talk about it before, think it was 16s and 17s.