Syntax highlighting doesn't appear to work correctly

Summary

On some themes, the syntax highlighting seems pretty broken.

Take this file for instance: https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/services/vulnerabilities/resolve_service.rb

Light and Monokai seem wrong, but for posterity I've included all the themes below.

Not that in my tests Sourcegraph is turned off.

Theme	Screenshot
Light
Dark
Solarized Light
Solarized Dark
Monokai

Steps to reproduce

Set a theme and visit the file.