Character dont hide his weapon

[Makabe]

I have bug like in topic titule: When I end fight character dont wanna hide his weapon, and it is soooo irritating, becouse it happened i think 4 times when i go hae-mujin then i cant complite raid, becouse character cant use Dragon Pulse. I dont know what to do becouse i try w8 even 20min and it is waste of time. Did someone know some good way how to solve this bug.