Brush strokes getting cut off at the end but then reappearing

Disclaimer: I just started using a new computer (Dell XPS 15) with Photoshop (running Windows 10) and had a hard time getting my drawing tablet (Ugee M708) to work properly with it. This may be part of the problem.

Like I mentioned above, it took me a while to get my tablet working properly with my computer/photoshop. I was finally able to get the pressure sensitivity to work, but now I've realized that when I make strokes with any brush that it seemingly gets cut off at the end. But when I go to make another stroke it reappears.

My last computer was a Mac and since switching over to this PC I've noticed that making brush strokes is significantly laggier. Why would this be happening on a brand new computer? Thanks.