Product filters messing up

I have purchased the PRO version 2 days ago. I have 7-8 products on my site. There are few fields on the checkout page which I want to show only for one or more specific products and not for every product. Obviously, I am using the ‘Show for products’ option in the filter section when creating these fields (using the ‘+Add New Field’ button in the billing fields tab) and adding the names of the products for which I want these fields to show up on the check out page.

But the logic seems to be getting mixed up. For e.g. I try to show a ‘Country’ field for one of the products – say product A – as mandatory but this field is showing up on the checkout of other products (say B, C, D) partially – as in just the description of the field is showing up as optional (doesn’t show the drop down).

Not sure what is going wrong. Any help will be appreciated!

The page I need help with: [log in to see the link]