Greyed out "level up" above abilitys if you hit level 18 and got the coin elixir

Those greyed out "level up" buttons dont get away and are a bit disturbing/annyoing. Recreation: Buy the tier 2 coin item, farm 650 gold, use the elixir, and when you hit level 18, aka where you could normally spend a point, all options are greyed out and there didnt seem a way to remove them.