Help with animation importing. Loosing frames after import to UE 4

Development Character & Animation
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Hi, I’m trying t o export an set of animations from Blender to UE 4, they work as intended in Blender. I However when I import them to Unreal the animations either don’t play at all, or don’t play to the end. I’ve made sure to set the scale of the mesh and rig. I’m at a loss.

This is the animation as it appears in Blender. Blender Animation - YouTube
This is the animation as it appears in Unreal. UE4 Animation - YouTube

Thank you in advance.