Can only boot to Sierra with USB inserted

I installed Sierra on my Windows pc (4790k + z87x board) and all seems to work fine out of the box. I'm running into an issue where I can only access macOS when the USB is inserted.
By this I mean, I can boot from the ssd, but to do so, I have to select the UEFI USB at startup to access Clover, then I can choose to boot macOS from the ssd.
I've run Multibeast a few times, and tried dragging the EFI folder to the root (saw this suggested somewhere) but neither works.

submitted by /u/ickies
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