Difficulty creating new computer themes due to background error

I was trying to recreate the themes i used to have because they all stopped working for some reason, but when i tried to change the background and go back to the themes menu, it just said solid color under background.














I only noticed this after making a custom cursor set but i don't think that would cause a problem like this. I've tried so many things to fix this but I just can't figure it out. I couldn't find any threads on this specific problem either. The main issue with this is that it makes it very hard to make new themes for my computer. The Weird thing is that sometimes it works, and I'm able to make the theme, but then it just says this,

and if I do press the use custom theme button, then everything just looks insanely weird, here's an example.

It's like it doesn't know if it's in high contrast mode or not. I've been considering resetting my pc to see if it fixes this issue. Anyway, I hope someone knows the answer to this, because I could just learn to live with it, but I think it would be a good idea to figure out how to fix it. Another thing I guess I should note is that these themes are all in high contrast mode, although this problem does still happen when not in high contrast mode, so that doesn't really matter.