Please, help me with this weird problem!

[Kazeon]

Guys, I'm editing HappyTauren's avatar of trollface model (yet I haven't got his permission) to be a stickman. But it's glitched. Do you know what often causes this?

as you see, there is blue line which seems like to be connected to the center of map. But it only happens at certain position/location.

Can someone fix the problem for me? the model is attached below.

Thanks for any kind of helps.

 

[Anvil]

This can be caused by corrupted bones or helpers. Also, if a parent bone has visibility off and a child bone has visibility off as well, the model can become corrupted. It works for me, test the model in other map.