Death Knight Riding stuck at 75 bug

[lawdestroy5]

So i dont know if im missing something but basically, when i try to train my riding skill I get Apprentice Riding and Journeyman Riding but once I hit Expert Riding i'm unable to train it because my riding is stuck at 75 and for Expert Riding you need 150. I think this is because you don't learn Archerus Deathcharger which gives you all your ground riding but i could be wrong.

[lawdestroy5]

Nvm wrong realm -_-