`grub-core/kern/efi/sb.c... prohibited by secure boot policy`

I have secureboot enabled, I followed RPMFusion guide. Everything was working as I wanted. GRUB Menu was boring and fonts were too small, So I installed vinceliuice/grub2-themes. Now everytime before GRUB loads, grub-core/kern/efi/sb.c... prohibited by secure boot policy message shows up. And fonts are even harder to read because it’s small and default font is still bad. Tried uninstalling and the borders are all messed up as if it’s missing font. But grub2-emu shows everything fine. Any advice?