I think I have made two posts on this bug, this being my third but with why it happens.
I was digging through settings, when I found this option. I disabled it, saved, and relogged and :0 non buggy snap forums!
This person had the same problom
(whats ironic is i replied to this saying mine is fine)
For further context, heres what I (and you) will see when you turn on dark mode in your OS settings with the "Enable automatic dark mode color scheme" setting enabled: