MordisinalX

Hey guys, Quick question, hopefully a quick answer. I bought Skyrim from Steam maybe a year or two ago, it came with DLC's (Dawnguard etc.) and I always assumed it was the SE, but apparently it isn't? (According to my .exe file) Any ideas why that would be? I believe I once had the Unofficial mod to fix bugs installed last time via a different mod manager, but Vortex tells me that I have the wrong game. I have no idea, first time modder. Cheers