In my sitemap I have a few sliders defined; at some point in the last few days, the UI stopped drawing the actual slider portion of the slider (icon, name, and value text still appear).
I wanted to add I had the same issue with Brave on Linux. Same root cause with DDG Privacy Essentials. Rather than totally disabling the extension I went to Settings->Extension Options, and added my OH URL to the Unprotected Sites list and all is normal again.