I don’t think I have ever seen it do exactly Stars x Players. Usually it will be a few shy of that and then give you 51% as the win condition.
The game doesn’t always generate the correct amount of stars depending on what your settings are. I’ve had it generate a significant number less than it should have on multiple tries. Some kind of conflict in the code I would guess. Did you actually count the stars?
but the leaderboard says 51 stars to capture
instead of the expected 65 I calculated from the game settings page.
review custom setting is behind the red arrow from the Leaderboard panel.
I think that when the stars map is created some of the stars which are too close to each other are removed, which would account for this situation you have spotted.
If stars are too close you can’t select individual stars (I found this while trying to create some custom maps using the double ring star layout, messes up your waypoints when moving ships around)).