Why can't I rank up?

[Knack972]

Here, let me list the factors

-I’ve gotten 125 hours of gameplay time
-I average about 8-10 hours a week
-I never go below a 1.0 KDR (usually 1.5-3.0 KDR)
-Lots of players are rank 30+ with less playtime than me

I have been inching my way through rank 25-29 at a grueling pace… something like one rank every two or three weeks. I know it isn’t important, but it has finally gotten to me >__>"

What would cause this? I assume it is a bug so it feels relevant to this sub-forum