Bug with the cloned setting

Bug with the cloned fields. When creating a second field group with no clone fields checked if used as a required field doesn’t work. You are forced to tick cloned fields to overcome the error that you are missing details even though all fields are populated.
1. Admin: Set NO CLONE but *required
2. input required fields and ADD TO CART
3. Error message bug – missing details as it will not accept populated fields and will not ADD TO CART

See attached image

https://www.dropbox.com/s/dcjg3zo4fw7hkb8/Screenshot_2018-12-06-Pack-4-Sibling-Option-%28Basic%29-KPS—SchoolPic-Kensington-Primary-School.jpg?dl=0