Missing Exp from last 3 waves (switch)

Tested this and after the survival map summary I lose the exp gained from the last 3 waves I did. This happens regardless of if I go to the tavern or replay the map. Have not tested on any other mode. 
this also means that starting at waves 23 means I gain no exp from the map. I have done this about 6 times now on different maps to confirm

This is a visual bug that only effects the displayed xp. If you've actually earned enough to gain a level, you still will. The issue is that, at higher levels, you need to ramp up the difficulty, do act 3-4 maps, and add hardcore/rifted mode onto your maps, or you're not going to gain enough xp in order to level up. But the xp you earn is still granted to you. I had that same problem when I was trying to level my characters,  too, where I thought I wasn't gaining xp. It turned out I was, I just had to keep grinding. 

 

This problem is especially bad when you're about level 78-83, since Nightmare xp doesn't scale very well. You can do an entire 25 wave map on survival/hardcore/rifted and barely gain 1 level. Thankfully Massacre mode xp is much more generous.