Animation Splitting messing up animation

I have a model with animations that I am bring into the scene. There are about 300 frames of animation, that when played in one go (akak Take001: All animations play) no problem can be seen.

When I split them up, I get an issue with the last section. It seems that the transform of one of the bones is being moved slightly to the left, which is very problematic, as the person's arms now go through the character.

Anyone have any recommendations?