Not all of sublimity-map is syntax-highlighted

[bigstas]

I love this extension. Sublime's minimap was the one thing I liked about it and wished Emacs had. Thank you!
My problem is that the minimap isn't syntax-highlighted throughout. Most of it is just white text.
I've noticed that the region that isn't syntax-highlighted is usually about 10 lines after the cursor and about 50-60 lines before it. The rest of the minimap has proper syntax highlighting. In small buffers, none of the text is highlighted.
My theme is manoj-dark, if that's important. I've checked this so far in buffers containing Python, Javascript, JSX, HTML, CSS, and Elisp.