CodePen Weird Diagonal Stripes?

Recently i’ve been having a problem with CodePen. Diagonal dotted stripes appear in the preview sections of my pens. I’ve never had them before. Has anyone else experienced this issue. I am using the latest version of Chrome.

The stripes disappear when i use Edge so it made me think that it must be an extension causing the issue but I tried in Incognito mode on Chrome and the diagonal stripes are still there.

I’ve attached a screenshot to show exactly what the problem is.