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1) Your weapon is far from zero coordinate it's no good
2) Your root_bone has scale 0.393 it's a bad, you should scale bone root to 2.54 and only before export
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3) Your weapon has tag_secondary_handle it sometimes doesn't work right for the melee, delete it
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How to fix it
First select bone_root and scale it to 1.0
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selected hammer and unbind skin
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then unlock all attributes
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set scale to 1.0
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And freeze transform
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Select mesh first, then add bone_root to selection and bind skin
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Place tags where they should be and delete tag_secondary_handle
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Set bone_root scale to 2.54 and export to fbx
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Scale root _bones is only affecting tags so when 2.54 only compensating some engine flaw, 0393
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