Botched up the vertex/winding order of the obj. The result is the model exploding into ragged crumpled spikes when the morph is dialed in. What modeler are you using to create morphs? Some modelers don't maintain vertex order. If you're using blender you need to check that option in the Obj import/export options: keep vertex order.

If you made any cuts in the model, but maintained number of vertices, this would also result in a wrong vertex order explosion.

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