if you want the mirror to work, you will have to do the weight painting for the glue to be symmetrical, and right now it's not. it would be better to make the bottom edge fully red (there is random yellow bits on the left side at the moment), an make the top edge fully green. then the sides would transition from green -> yellow -> red (top to bottom)
so the hips have control of the bottom of the midsection, and the torso has control over the top
it is generally easier to to rigging on deformers instead of mesh imo
and it appears in other layers too