Not ranking up in halo 3?

[outcast]

me and my friends started new accounts and have been playing team slayer and as of right now we have played about 45 games and have only lost one of them and we always go positive and usually win by alot but we got to 12 then won every game since then and about 20 to 25 games later we went to a 13 and then we played a few more after that like 5 i think still didnt lose but still again no rank up my gamertag is ltd kletus so you can look at my stats let me know what you think
on another note we do not play on the same xbox and our exp goes up but rank does not, and i know that it gets harder the higher that you are but when you dominate and have a record of 45 wins and one loss it should be much higher that a 13

 

[Juggalo]

you have to keep wining the higher you go the harder it is to rank if you go to your rank and details then it will say how much exp you need to advandce

 

[Justin]

It takes a while to rank up and if the account is on the same xbox then that might have something to do with it.