If you ever come across this, maybe this will save you a few minutes...
The BCD registry holds values for the disk location of the boot files & all operating systems listed in the boot menu. Each of those is assigned a randomly generated GUID. The device BIOS also stores those locations, & sometimes that data that's stored in the BIOS is added to the BCD registry, & then it appears in the boot menu. The how & why this happens is a bit vague -- it happened to me when I updated this motherboard's BIOS, but I've read of others having the problem & no known cause. The extra entry or entries doesn't hurt anything that I'm aware of, but can be confusing. To get rid of them is fairly simple...
Start by running EasyBCD. The extra entry did not show up in EasyBCD's "Edit Boot Menu" -- it showed up instead in "View Settings" with Detailed mode turned on. In the top listing for Windows Boot Manager it showed 2 new categories named Firmware Applications -- one listed the DVD drive, the other the hard disk where the boot files are stored. Below that are the Windows Boot Loader listings, one for each OS [i.e. copy of Windows] listed, which you don't want to change. Under Firmware Applications there was a GUID listed [e.g. {de92b019-1078-11e9-a7d9-9194a1d1dd92}] -- copy that to use with the following command, running the command prompt as admin., replacing ENTRYGUID with that long number you just copied.
bcdedit /delete {ENTRYGUID} /cleanup