My character glitches when I equip a basic tool?

I have custom animations (2 Walk and Idle) in my game and when i pick up a Basic Tool

My character starts to shake around or bounce around even when I'm walking around or standing around.

btw the tool is just : Tool and Handle

I have no idea whats the problem, maybe the custom animation crashes or glitches. I've been looking for a solution for a month now

Thank you for reading And I'll be thankful if someone will answer. :)