This is likely what happened. I think I’m gonna format the Windows SSD attached to the server (old install) and reinstall grub. Tomorrow, I guess. :(

Edit: Now that I’ve had a moment to think, I realized that I deleted grub. It was on another SSD that I wiped. It was on the SSD that my old OS was on that I wasn’t using anymore. But my actual Linux install came from another computer. So when I dropped it in what became my server, I installed grub manually on the old SSD (which has now been wiped) to boot to my Linux SSD.