Wacom Glitch on Photoshop

Hi there,

I have Photoshop CC 2015. I have a Wacom Intuos Pro PTH-451-ENES that I use to paint for work. I think it's a 2015 model.

Recently, everything works fine until I zoom in on an image to paint. Once zoomed in, I press the pen down to paint and the page scrolls elsewhere, the scroll bar turning white. From this point, the mouse symbol disappears whenever I try to paint, even when I zoom out again. When zoomed in, the page scrolling keeps happening. When I try to drag the scroll bar, the whole page is dragged down.

I have a video of the problem here: Wacom Tablet Problem - YouTube

This is a problem with the tablet, as the same thing happens on different computers with the same tablet. I have tried reinstalling and updating the tablet driver but the problem remains.

If anybody knows what's going on, I'd appreciate your help! Thanks!