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I'm trying very basic stuff here.

I have made a running animation on a armature rigged soldier model. The animation plays all fine in blender , but glitches out a horrible mess after export to UE4 as FBX.

All IK bones (colored sticks) are orphans and have unchecked Deform option

I have tried this like 50 times in last 4 days with different animations, Some time some animations will work and some time they suddenly start to glitch if I make a change and some are just already glitched. However inside Blender They all work fine

Animation in blender

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Aniation in UE4

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Export settings for Mesh

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Export settings for Animation

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observed points:

1.The animation worked fine earlier when I exported it halfway in its making to test.

2.It looks like the action editor may be responsible as sometimes cleaning all keyframes and making a new animation from scratch fixes it but this is not feasible.

3.This mostly happens if I change any keyframe (like move a bone and replace the keyframe with that pose using I key)

(Attached .blend and texture file)

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