Visual bug with Ancient Coin line and Elixir of Skill

In my last game, I played as Janna, completed my Ancient Coin quest, and used my Elixir of Skill. When I reached level 18, the game still acted like I had a skill point, and showed a grayed out arrow over each ability. Of course this is a simple visual glitch, but I think it should be reported nonetheless.

I couldn't get a screenshot because I don't know how to take screenshots on my computer...