Searching for how to fix this specific bug

I’m having some trouble with making some knockback smooth. This is my issue:
https://streamable.com/gt5ar1
The thing is, the knockback works perfectly fine on the screen of the target, but not on the screen of the attacker (and I assume any onlookers). I want to make it as smooth as how the target sees it. Also, you can see me dashing in the script. Once again, smooth on the dasher, not smooth on the target.

Any helpful tips would be greatly appreciated!