Does UEFI info on the hard drive's boot partition gets written to the system's BIOS?

Question

I was transferring a set of existing raid drives into a second-hand server, an HP Gen9 server. I observed 2 interesting details:

1. When I was configuring UEFI boot Order shown in the picture below, I saw many instances of Windows Boot Manager. NOTE, at that moment I had not booted from the newly inserted RAID drives even once yet.
   [Question] are those multiple instances of Windows Boot Manager the previous OSs that were running on this server?
2. The OS of the existing RAID drives were successfully detected. They can be seen residing on the last item of the boot order Embedded RAID: Smart Array.... When the machine first booted after inserting the existing RAID, it went thru lengthy attempts of CD/DVD and NIC boots before booting into the RAID (win2008 R2). The second attempt to reboot the system however went straight into Windows.
   [Question] This seems to suggest that the boot info on the RAID was somehow transferred to the UEFI BIOS, did Windows do that or did the HP server did that? If I go into the UEFI boot Order again, I should expect one more Windows Boot Manager, 6 in total?