I'm sorry - Problem with arms' rotation

I don’t know if I was comprensible in the video:

https://youtu.be/JEkiS2aXE8o

In the Z axis the hands seems to have the delay but it seems a drop of frames/lag. anyway the I don’t think this delay is caused by the blueprint, but by the fact the arms are detatched from the camera in Hierarchy.

How you can see, the X axis, don’t modify the depth.
Maybe the pivot is rotated,