Theme stuck in dark mode

Oh strange. So that worked for me. So changing system settings really affects the display mode of the website. How can I change that?

I also noticed that some colors don’t transfer from light to dark mode when the browser or OS automatically selects the display mode. Like I have dark mode on system-wide, and the color palette is selected in my Discourse Preferences, but the website is dark and the color is blue in a lot of places. (See below)

But when I switch to light mode system-wide, everything is the correct colors and green where they are supposed to be. (see below)

How can I fix this?