Weird problem with tool placement

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As you can see, when I try to parent this free model AWP to the character named Shiiro_exe, it didn’t go to the right hand and instead, the model stays there and the right hand was teleported to there. Anyone knows on why is this happening and a solution for this? I’m pretty sure this is an easy fix.

Is it fully unanchored? Make sure that there are no anchored parts in the model.