I have other mods installed, but I've tested this without AstralSorcery installed and the sky color is fine.

I know this is happening, however i couldn't find the source for it yet. Will continue to search :|

Well, i guess i'm gonna adress this with the first solution that solved this problem; It's not a great one so i'll need to get back to it eventually, but it'll solve this for now with no visible other issues.