Animation Playing Different on Different Characters

When I create an animation using a default roblox character, it looks completely fine on that character. However, when I use my abnormally tall character, the animation looks really messed up. Is there any way to fix this?

Maybe show videos of what’s happening.
What is the rig you are using for both, R6, R15, or custom?

They are both R15
The model I created the animation with:

The model that has a different bodyscale and makes it look strange:

(sorry about the low quality, it was the only way I could share it)