An error using wrong weapon keeps happening

This problem keeps happening since yesterday.

My primary weapon is a dualstring bow,but after playing awhile,the shots from me become single projectile obviously it becomes shotting from my sub composite bow.If i exchange them,i'll shot dual projectiles by my composite bow awhile,then happen again become single projectile,lol.

If i remove my sub weapon set,it will become another error that i can't cast certain skill like vine arrow.

Idk,it's still happening today while i'm playing.I tried to close game etc. but never worked.

Hope you can solve it,thanks