Clover Bootloader on incorrect screen, problems with primary display - RX 580

[theStyg]

Hello. I'm running two monitors - primary is 2K, secondary is 1080p - via HDMI on an AMD RX 580 8GB. The Clover Bootloader boots to the secondary monitor, which is fine by itself but I notice certain applications (Logic Pro X) sometimes boot to that secondary screen because of this. Sometimes just the loading screen appears in the secondary, other time the entire program appears there.

In addition, I think this is causing problems in Windows 10, as I dual boot into that on occasion. Sometimes Windows 10 will momentarily treat my secondary display as the primary in certain applications. I am unsure why this is happening, and it's started becoming sort of a hassle.

Swapping the cables seems to do nothing.

Is this more likely a Clover issue or a BIOS issue? Any advice would be great!

Motherboard: Gigabyte GA-Z170X-UD3 Ultra

CPU: Intel i7-6700K

GPU: Sapphire Radeon NITRO+ RX 580 8GB

OS: macOS Mojave 10.14.6