Disc Order keeps changing£

So I have the Razer Taichi X570 with 3 NVME slots onboard. The first slot, closest to the CPU is where I put my first NVME drive. I installed windows and under Disk Management it registered as Disk 0. But as I added in the other two slots, it changed it to Disk 1 and now disk 2. Why does the disk number keep changing? I thought the disk number was tied to the motherboard physical location?

How can I get this back to Disk 0? When I check the BIOS it's already marked as the first disk to load so I don't understand what's going on here. I know it wont hurt anything but I am OCD about this and I really want Disk 0 to be where my OS resides. Any ideas?

ASRock_TSD wrote: Dear craighnt, Thank you for the posting. Regarding your question, we recommend booting into BIOS\Boot page, you can configure the boot option under this page. Thank you, Best wishes, ASRock TSD

Thanks but the boot order is already correct in the BIOS, it's the actual drive numbers that changes when viewed in Disk Management. For example, my "C drive" is at the top of the list in the BIOS, but in Disk Management it's labeled as C drive "Disk 2" instead of "Disk 0".

Is there a way to change the drive number (not just the load order) in the BIOS?