Some fan editors take older DVDs or lower-quality WEB-DLs and upscale them to 1080p using AI (like Topaz Video Enhance AI). If a fan created an "improved" 1080p version in 2017, they might tag it as 2017 to distinguish it from the original 2008 release.
After some digging, it appears that a movie titled "What Happened in Vegas" was indeed released in 2017. The film, directed by Justin Zackham, stars Kevin Hart and John Leguizamo as two friends who get married in Las Vegas after a wild night. The movie follows their misadventures as they try to get back to their normal lives. What.Happened.In.Vegas.2017.1080p.WEB-DL.x264-e...