I think I have the same problem (but I can't see your picture to verify that).
It's a "hashed lines" colour display, rather than full colour. Doesn't happen that often.
Windows 10, latest Chrome (Version 75.0.3770.142 (Official Build) (64-bit)). Turning off all Chrome extensions has no effect. Web site refresh does not correct the problem. Internet connection is good. Couldn't find anything in Windy's FAQ about this. It went away before I could try Windy's error console.
Here's two images, the second is zoomed in: