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  • Maybe your firmware is not enforcing the secure boot somehow? It seems that you have unsigned images, give your BIOS settings a visit to check if any setting is not as it should. Commented Nov 10 at 14:31
  • @td211 I triple checked the BIOS since I was getting very confused. Unless my motherboard firmware is straight up lying to me, Secure Boot is definitely enabled. Commented Nov 11 at 5:56
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    Maybe your system is booting from a previous signed boot loader, which is still saved in the boot order of your UEFI as fallback. You should try to delete all other boot loaders in the filesystem, besides the one you want to boot from. Please take note, that this might make your system unbootable. If it becomes unbootable, you will know, that only signed boot loaders are able to boot. So switch back to non secure boot, and boot the unsigned boat loader and reconfigure your system. Commented Nov 11 at 10:59
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    @paladin This should be posted as an answer, since although it doesn't provide a definitive solution, it gives a possible explanation of why the system is able to boot and a way to rule out that "secure boot is not working". Commented Nov 30 at 9:25