When using NOP Commerce for this storefront we have built in a filtering system for size/color combinations.
Version 2.8
You can see it here -
http://www.abra4me.com/elila-1305-bra
Check the color selections for 34F

If you change the size to 36F the new available colors are listed.

However if we enable the NOP Mobile feature this filtering is ignored and it allows users to select any color for any size listed.
We were getting orders for products we didn't list and didn't have a SKU for.  It took us a while to discover this.

We have made the site responsive to a degree, but does anyone have any idea why the mobile instance would ignore this filtering?
Any ideas on how to fix?

Thanks in advance

I should have mentione that we have disabled the mobile feature at this point to avoid all the unfillable orders.