Gameplay (level up bug on Brand)

Yesterday, I was playing Brand and ended up dying as I was trying to level up. After that the icon that appears when you can level up an ability wouldn't go away from above my W ability (all the other ones did). I couldn't click on it or use a hot key to make it level up. I ended up leveling other abilities until I hit level 6 then it just went away after I recalled.
P.S. I forgot to get a screen capture.