Weapon Rotation bug

Hello Devs,

I created a weapon system (including a Pistol and a Rifle).
All worked fine. But when I started the editor today, somehow out of nothing, the rotation of the Pistol gets buggy after I shoot.

This only happens with the Pistol. All the other weapons are working fine.
I have no clue how to fix that, since this bug came out of nothing. It used to work so well.

Where do you put the weapons on?
They don’t look like attach to your character hand…

They are attached to the character mesh. Every weapon has it’s own socket at the mesh’s hand.

It worked all fine untile today. Now the gun rotates and behaves weirdly.