Not receiving XP

I am not receiving XP for any actions. If I trade, it makes the sound for XP but my level never changes. If I kill a mob, same thing, the sound plays when I pick up the XP but my level never changes. I don't get XP when I mine either. Sounds plays, but XP bar never changes. I played for a couple hours and it stayed on 17 and the bar never advanced. Smelting things in the furnace, same thing, the sound plays but the bar never changes. 

My items with mending were also not mended.