Mesh is warping when I import it from blender.

Im getting these weird “feathers” sticking out of the back of my mesh. They aren’t there in blender. They only show up in unity. Does anyone know what i can try to get rid of them? Thank you.

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I solved the issue. I had some vertices that were unassigned to any bones. I repainted the weights in that area, and now the model matches the blender file perfectly.