Hand Teleports to Tool's Handle

So I’m trying to animate a weapon but upon placing the tool into the rig the hand teleports to the tool…

I tried searching up possible causes but I couldn’t find a fix. The tool IS NOT anchored but the weapon’s parts are welded together so maybe that has something to do with it?

Edit: so I removed the welds and it fixes that specific issue, but how do I keep the weapon together and animate it too?

Bit of a stupid question but is the hand welded onto the dummy or the Katana?