Currently there's a bit of an issue where if a wand gets a Mana Max boost, and then fills up to that new Max, it will not go back down to the normal Max Value unless the mana is actually spent. This wouldn't be such a big issue but it seems like the ActionBar GUI can't understand the mana being higher than mana_max, so it breaks the bar and displays this:

until the mana falls below mana max again

To Reproduce:
Get a wand with something like Mana Max 100
Hold a boost item in offhand with something like Mana Max Boost 1
Allow Mana to generate past its normal Max
Stop holding both wands
Hold the main wand again, and the actionbar will be broken until Mana falls below Max again