Max level?

Its a good game and all but I just did a ultimate fusion on my volcano dragon and turned into a hurricane dragon then it said he was already max lvl. So I am not sure if it is a screen glitch and I tried to lvl him up but it it says he is max lvl and his stats did not increase like he was max just like he was lvl 1. Plz help fix this or tell me how to fix it

Logandog9 about Puzzle & Dragons (English), v8.2.0