Atlantico: Strange, I get the reverse (almost) where Starfighter is the *least* popular Star Wars game on gog.com and the second to last popular game of the Lucasarts games on gog.com (one above Afterlife)
https://imgur.com/SXpTwft I'd be willing to bet money that the order in your result is the accurate one, and this is indeed just a glitch. I'm not sure if it's for some reason "wrapping around", so that the game at the end of the list is somehow showing up at the beginning, or if something else is happening, but
TIE Fighter is almost certainly the
actual best-selling
Star Wars game on GOG to date (owing to the fact that it was never sold online as a download before), and the others look like they'd be in about the right place, too, relative to when they were released here and how sought-after they were.
I just thought this was funny.