Have you tried only unblocking the Canvas tracking protection? This sounds like what happens to me when a site actually uses the feature to render something but it's blocked.
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I've got enable WebGL checked if that's the same thing, not sure where to find the canvas tracking protection
It's different. Try going to the site, clicking the permissions button (two lines with circles at the ends) in the left of the URL bar, and see if 'Extract canvas data' is blocked. If it is, I'd suggest unblocking it and then re-loading the site, navigate to the part that's messed up and see if it asks if you want to allow canvas data extraction. If so, you may need to reload the page again for it to work properly. If that isn't the case or doesn't work, I'm out of suggestions.