I have completed the same level a few times now in the last hour and 3 of those times I have gotten 0 experience. I first noticed because I needed 7 (dang) experience to the next level. I fired up the same map and sped through it and should have received 3500 exp for it, got 0. Did the same thing again with the same result. Finally I got exp on the 3rd try but then the try after that same affect. I was wondering if you don’t get exp if you end up getting less exp than the record for that level? I believe a few of those tries I missed a battle amulet that I had gotten on my top try.