Costume weapon "jump" bug

Hi everybody!
I have a "jump" bug when i use the costume body/hair and costume weapon same time.. and i get off the mount then my character "jumping".
How to fix it?

Show me your charakter jumping

First:
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Second:
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The same bug

Hmm, thought it would look more funny.
It seems like he is trying to unequip weapon but then cancels the animation.

Yes, but is very irritating bug :D
Possibly u know how to fix it?

i have this fix its not for free