Hello there, I am new to the forum and am currently desperate to have my problem fixed.
So to begin with let me explain my problem

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This is my current model, fully rigged and paint weighted.
Seems normal at first glance.

but when I move my master controller around the scene...
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a certain part of my character's neck is drawn to the middle of the grid.

I checked the rig and the controllers and there seems to be no problem there.
It's just some faces in my character's neck to its collar bone is drawn to the grid.

Please help, I'm pretty desperate.
Is it a grouping problem?

This never happened before, I did an optimize scene and now this happened. @@

Help