Some kind of creases showing up on screen? I don't know how to describe this.

When I use the Kyles FX Box Bristle Blender 2, the canvas gets divided into four blocks that take the brush at different degrees of flow. I've tried this with about twenty other brushes and I'm not getting the same glitch with any other that I can see, (there's like 400+ brushes in there). Can anyone else get this same result? I'm using the latest Fresco on a Windows Surface Book 2 running up to date Windows 10, with surface pen input.