Hey
i encountered some problems that when i got enough ranks for promotion i had to go to another server or else it wont give me promotion.i tryed to leave it thru night once and when i got back from work i still had old rank with +50 points then i needed for promotions.Same thing happens to me on BF2.
PS:the stats are late i am some ranks higher

This happens a lot,one of two things has happened.

1. Your stats will update after that perticular round has ended

or

2. The server that you got your rank on reset later that evening and the stats never went through.

I dont play Bf2 anymore but yeah I often had to go to a different server and get one kill and then i'd rank up. Sh!t happens lol