[other] Grub 2 can't boot into Windows 10

I recently installed the latest version of Ubuntu, and everything was fine.

I was messing around, and then I wanted to get back into Windows. I restarted the PC, and it went to the Grub boot loader screen.
I tell it to boot into Windows 10, and it just loads back to the Grub boot menu. It essentially loops back to the Grub boot loader screen when I want it to boot into Windows, yet it loads Ubuntu just fine.

I keep Ubuntu on an entirely separate drive from my Windows install, so it can't be an overwritten partition. :/