Pressing modifier on Wacom tablet pen button brings up color picker, then move tool

Up until recently I had the button of my wacom tablet pen set to a modifer, ctl + opt, which would then allow me to increase/decrease brush size by moving the cursor out or in.

Recently, when I press this modifier, I can no longer change my brush size, and instead, the color picker tool is brought up. After I let go of the pen key, the color picker goes away, and instead I am left with the move tool turned on- all while the brush tool is still selected in my toolbar. When I hold control and option on my keyboard, I can adjust my brush size as before, and pressing this key combo on the keyboard also will reset my tool to brush after I am set to move after using the wacom tablet pen button.

When I first noticed the problem happening, maybe a week or 2 ago, I would also have a very strange problem using chrome: for whatever reason, every key on my keyboard would type alternative characters, from greek letters like delta to copyright symbols. This hasn't happened since about 2 weeks ago though.

What is going on? I can use the keyboard keys to change brush size but it is frustrating to lose this easier way of doing so, especially so suddenly and with no explanation.