Not sure how but I lost fragments. Went through the raid with my regular fireteam, opening all the same chests and stuff, did Vosik on the first day, and death zamboni on the second, but somehow they ended up with 15+ while I only had 5 which I remember getting after death zamboni.
Timeline:
1st Day: Had 1 key before raid from first character, ran through story on 2nd character for 2nd key, transfered it to 1st before raid. Finished Vosik with raid team, went to death zamboni and called it a night. I rememeber getting fragments along the way as they were popping up on screen.
2nd day: Completed Death Zamboni with same raid team, saw fragments pop up, went to open cache chest with key, checked inventory, 1 key left, but only 5 fragments?
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Same thing happend to me today man. I had 65 fragments and today i have nothing. I havent used them and i havent change them to key. I am pretty sure. I was saving them for the hard raid.
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10 fragments equal a key. If you're 10 fragments short, then you used them to form a key. You probably unlocked a key chest after beating one part of the raid without looking to see if it said open or if it said it would cost a key.