@thismarty I've not been able to replicate the first orange background color that you are seeing, but for the second screenshot I know what's the problem - it is the website tweaks - looks like you have an dark background tweak applied to the website, so it's actual background color is white, but because of the tweak it changes to dark. And the sidebar is failing to adjust to that fact.
For the first screenshot, please let us know how you are able to replicate it.