Installation problems.

So I've managed to go through everything very smoothly until I ran the macOS installer. Basically once I erase my current drive I picked macOS Extended (Journaled) and GUID... and when I start the installation at about 14 minutes left the computer reboots, but instead of continuing the installation it goes back to the language page, putting me in an endless loop :/

I am running Intel Core i9 9900K, GeForce RTX 2080, Z390 AORUS MASTER.

Is it something I did wrong while setting up EFI? Or is something messed up in the bootloader??

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EDIT: I used iMacPro1,1 as SMBIOS