Gromp Messed Up My Jungle!

So this is legit, but i was being leashed at gromp while i was playing Volibear, and i smited first since i took bite to execute it. When he was near death i bit it and it just poofed away without any gold/xp gain. it didnt do its death animation, it just kinda- poof.

I have it in my match history, the game with Volibear, at 2:16 i reported it into chat saying it didnt xp/$. Rito plz, just updated and it hasn't done it first game, but it put me on a level tilt and i had to come back xp wise by ganking lanes.