LHIK Working Bad when the character sits down or looks up.

[TarkovskyACS]

Hi everyone, I created a left-hand HR for my character by watching this video on YouTube, but as you can see in the video, I’m experiencing a problem. What could be the reason for this? I took the animations I used from a ready-made tutorial. Could there be a problem with the animations?

How To Use IK To Fix Your Left Hand To A Weapon - Unreal Engine 5 Tutorial