Monk Mod Level 19 Progression

[Altern8]

Me and user Froggy_Boy have spent the last few hours progressing through the monk mod but we have gotten stuck on the wither killing with a bare fist. According to some players on the server it is bugged and cannot be achieved. I was just hoping that someone could fix the glitch, or use a command to get us to level 19. We have killed 6 withers so far and are getting tired of trying. 

 

Thanks, 

Altern8