Bug Experience bar

Well I spent a few days without playing since I had serious problems with very high latency until today I went back in and realized that I did not have my experience bar and I did not gain experience killing enemies or missions.

P.D: I'm level 64 (Truen, Paladin)

I would like to know if you have any arrangement?

https://scontent.xx.fbcdn.net/v/t1.1...94&oe=5FF98386

maybe you have talk to the npc to turn off experience? Try to talk to him again to re-enable it.
NPC is in the room behind stormwind kings https://www.youtube.com/watch?v=p-cnTyCvx5E