Point not moving with bones

I was making a low poly character and rigging the body like this :

But as you can see there is a point that won’t move with the left side of the rig and stuck in a point.

Then I realize that it move with the right rig

I don’t know what’s wrong and how to fix it can anyone help me?
I have re-rig it, check the IK constrain, and check the bone parent I can’t seem to see what’s wrong with it.

P.S : I use symmetrize to make the left side