Oh dear..Did you use the VIP service of VFS? I had the same problem when I submitted my Fiancee Visa application..I ticked the "FIANCE(E) / PROPOSED CIVIL PARTNERSHIP" category and didn't know it was for same sex!
Good thing I availed the VIP service and the VFS attendant informed me I got the wrong form. So she gave me the option to go to a computer shop nearby and fill up a new application form again and then after around 30mins, I got back and she accommodated me again. She said lots of applicants, especially the Fiancee Visa applicants, have made mistakes because of that category. Fiance(e) should use the MARRIAGE type of form under SETTLEMENT category.