Undo affects both brush setting and brush stroke

Thanks so much for helping! I'm really not sure how else to phrase this, and chances are someone else has articulated the problem an entirely different way, so I was unable to find that issue by searching. Sorry! I did try.

So, here's the deal: I'm fiddling around with my brush settings: I make a minor change to the settings, make a sample brush stroke with the brush tool, hit command-z (or edit > undo, doesn't matter which), and the undo action will both remove the brush stroke AND undo the last setting change I made. I could understand it if it insisted on undoing the setting change if I hadn't taken any other action between changing the setting and making the brush stroke, but I haven't. It's essentially undoing two steps with one undo.

Now, that said, there is absolutely no circumstance under this yellow sun that I ever, ever, ever want the undo command to ever affect anything outside of the canvas anyway. Is there a way to disable undo from affecting panels?? I'd assuming that would be a solution to my oddball bug, even if it's not an actual fix.  Thanks again for the assistance! Stay safe, and stay healthy!

Edit: I'd also like to add that I'm using a brand new Wacom Intuos Tablet, and I've noticed that without using the undo command, it seems everytime I use the stylus to create a brush stroke, the brush settings revert the size jitter control back to Pen Pressure. Could this actually be a driver issue I'm looking at here?