That looks like a GPU redraw issue. On Windows I would ask you to update your GPU driver, but it loks like you are using a Mac, so:
Try going to preferences > Performance and either check or uncheck Legacy Compositing and then restart Photoshop.
If that makes no difference, reset it the way it was and go to Preferences >Performance Graphics Processor advanced and change the drawing mode to Basic. Again you will need to reset Photoshop.