My PC sometimes boots into a "hidden" open core config, which I'm unable to find

Hey all,

The strangest thing. My PC sometimes boots into a "hidden" open core config, which I'm unable to find on any of my hard drive EFI partitions.
My current setup has 4 Hd's:
2 NVMe's (1 for Win10, 1 for BigSur), a Sata SSD (for audio stuff), and a 4tb spinning disk (for more stuff).

Opencore is on the EFI of my BigSur system drive, where it makes sense. When I explicitly tell my gigabyte bios to boot from this disk, all is well, and I get the right config.
But when I just pick the "Opencore" entry in my boot list (EFI entry), My system boots up with a different boot config!
Differences:

• -v is enabled
• System definition is different (18,3 instead of 19,2)
• Hackintool sees different version of opencore

So this is clearly some older version of my opencore config, only...I can't find it!
I checked the EFI of all the hard drives on my system, and performed an nvram reset, to no avail.
How would you solve this?

Kind regards,
Alex