[Colors/Fonts] Only the keywords obey color scheme in editor

When I change color schemes in my editor (default, darcula, imported theme, change values myself, etc), the only colors that change are the keywords (e.g. public, if, return, etc.) while the rest of the code is the same color (generally white/light gray if on a dark background.

For example, Darcula results in orange and white code; Ladies Night results in pink and white code; Shura Dark results in blue and white code. These examples are all on large diverse codebases, and these themes should show more than 2 colors. I am having this issue on windows and linux (ubuntu). 

This is quite frustrating and I am not sure how to solve this issue. Any help would be greatly appreciated.