Weird bug - ignoring mouse input through wacom tablet

So, I know this isn’t a big deal, or really important, but I found it amusing and perhaps it may help understand if there are any other bugs related to mouse/touch input.

As a Designer/Illustrator I have a Wacom Intuos Pro tablet hooked up to my computer, and I had gems of war open to play a few games when I needed a break. Since I had the tablet in hand I figured I’d just use it instead of the mouse, but despite being able to click and seeing a little animation of ripples when I clicked gems of war completely ignored all input via the tablet pen.

Drivers are up to date, and I’ve tried again since a recent driver update.

Again not an important bug, more of a weird one just considering this game is also played on tablet computers and mobile touch it seemed odd to me that this happened.