i have this problem too.

Not long ago, every time I kill players, then all well and weapons opened for me and I climb ranks, but when I’m out of the game or when starting a new map all I’ve done is reset, if I opened arms is closed again, if I got rank is falling back to 17.
I opened a lot of weapons and they closed me back, and I could have been at least 20 RANK But all the time I go back to 17.
I have the problem on every server I go to.
Exactly the same problem also have a friend of mine.