I am having difficulty with obtaining the weapon attachments in singleplayer. I've already beaten the singleplayer campaign on Supersoldier, collected all the souveniers, dog tags, emails, and car keys, and have obtained all the suit upgrades. I went back and replayed the campain to obtain the weapon attachments I missed (using YouTube videos to tell me where they are), but they won't stay. I currently have 8 attachments, and whenever I get a new one and complete the level (not exiting out until the next level begins and is done auto-saving), I go to the main menu and I still have only 8 attachments!! I Googled the issue and was reading online in various forums and apparetly a lot of other people are having this issue as well. HELP!!! I want 100% on singleplayer!!!

100% is not possible since you can only collect 12/13 weapon attachments. the 13th is the hologram decoy which cant be obtained in sp.

just saying.