Is this Blender Weight Paint problem?

Good day community.

I have made a ragdoll, but it streches at some points, I just want to know if this is Weight Paint problem? I use Blender.

 

it looks like you have a vertex that isn't weighted. the root is ragdolling, but this vertex isn't being told to do anything, so it doesn't. take a look at that vertex that's hanging out, and see what bone its weighted to, or set the weight to the bone it needs?

 

Yes, it was weigth paint problem

 

Yep. I remember this happening to me, a few times too.
Just missing one vertex in weight painting, can cause all sorts
of strange, yet wacky problems, to a 3d character/object.