Mouth Group - Alternate mouth Parallax NOT WORKING

[raghuls49190192]

I made a 'Mouth Group' under 'Head' group.

I created a swap set 'Mouth' and 'Mouth_alt' inside 'Mouth Group'.

Both are set to independent and 'Head' is set to parallax is at 1500. 

It works perfect for eyes, nose and the 'Mouth' unless I swap to 'Mouth_alt', the parallax doesn't apply for this 'mouth_alt' at all. I tried all possible combinations with Weld, Hinge, Attach to... 

Although, I found that if I move the 'Mouth_alt' layer on top of 'Mouth' inside 'Mouth_group', it works the other way. Only the alternate mouth group works with Parallax and not the other one now.

PLEASE HELP