Problem with custom weapons on NPCs


I’m currently making a mod, I added all the weapons I wanted, it works great for the player, however for the NPCs it doesn’t look awesome, the custom weapons at between their legs, and some other are at their foots.
How can I fix this problem ?

Video :

By the way, yes I set the “anim_prefix” thingy in the weapon script files for NPCs

What am I missing ?