IK Movement gets messed up while playing animation.

Hi, everybody I bought Twinblades Animset. Now, I’m trying to retarget animations to my character. It works fine except for IK’s movement which positions to blade abrupt places. How can I fix it? I tried retargeting skeleton etc. It just doesn’t seem to work
Thanks in advance.

https://i.ibb.co/WsH2x4L/Untitled.png https://i.ibb.co/QvmXvkL/Untitled1.png https://i.ibb.co/HTY9rcn/Untitled2.png https://i.ibb.co/NnZT1SX/Untitled3.png