Enetered 3 of my pokemon, whose levels were all above 100, into the level 50 bracket, and when the 7 rounds were over, kept my pokemon at level 50. I know this isnt an intended feature, and im not sure if anyone else has had this issue, but just a friendly heads up this may happen to you. Heres hoping a future patch fixes this issue 
Sorry, no fix or anything, just here to say the same thing happened to me.
Same here, I hope a dev can see this and hopefully fix it