Hey there 
Hmm, this seems like it might be a graphics driver bug. I’d recommend checking the dev tools console (F12), and seeing if there are any errors.
Chances are good that it’s only on your browser and your players might see it fine.
You might need to make sure that hardware acceleration is enabled, then check to see if you have any graphics driver updates, if so, install them. And then restart your machine! Hope it helps!