I was testing new features to be implemented next week and I experienced an issue that seemed to be affecting some users.
On an iPad with IOS 13 it has a built in night/dark mode. (That on my wife’s iPad automatically comes on at night).
It a great feature, but it means that skins developed will look different on The Anfield Noise. All themes become dark themes that don’t look all that different. (However some don’t look great with logo).
If you are having trouble changing theme, make sure your IOS is not overriding the theme.