Importing animation causing strange stretching on model.

Hello! I have a question regarding the strange stretching when importing an animation from blender.

Here, you can see frame 15 of the animation in blender:

When I import it into Unreal however, it stretches like this:
image

I’ve checked and it seems like none of the bones are out of place to cause this. The entire animation works flawlessly in blender, but when in unreal all of the animations I import of this character stretch in this way.

(Here you can see the animation for turning left, where the neck and top of head is stretched to create a sort of spike)
image

I’ve tried loads of different configurations for retargeting. I have no clue what else may be causing this. Does anyone have any ideas?

I just learned something new. The bones DEF-spine_009-DEF-spine_011 are being stretched by the animation when imported to unreal. You can see them here.

image

I have NO CLUE how to fix this.