Moodle Version: Moodle 3.5.2 (Build: 20180910)
Theme: Campus (v184.108.40.206)
I have tried both the "master" and the "MOODLE_34_STABLE" branches found here: https://github.com/dasistwas/moodle-theme_campus. Both with the same results. I also removed any/all CSS additions in case I had inadvertently caused this myself to no avail.