Sorry to hear about the medal not pushing to your account! Did you encounter any large latency spikes or host migrations during the match? What game mode were you playing in when you got the medal?
If you feel there may be corruption, I can always check out your data. Just let me know the following:
There wasnt any lag spikes or host migrations. Mode was ground war domination. Only thing i can think of is that i got 3 kills in round 1 and the next 4 in round 2, but that usually works for me and the medal still popped on the 5th kill.
Im on Xbox, GT is Megadog14. The game is still in my recent games folder if you need it (map was Drone).
That explains it. The medal will pop up but the Bloodthristy challenges won't award if you don't get them in one round. Splitting it across two rounds is the problem. If it worked for you before that is really odd because many many many people have found out the hard way that it doesn't work for the majority.