A couple of strange things can be observed in the system, Marusur.
Firstly, in the save game, Missiles Disappearing, if you look at the cruisers in attack-move mode at the top right (The ones firing at the friggin' forcefield-protected munitions-boosted special forces command post that I've decided to blockade until I have tech III bombers) their missiles seem to suddenly disappear after only a second of flight. I can't see a counter-missile turret around or any visual indication of something destroying the missiles.
Secondly, in the save game, Odd Spawning 2, If you watch the centre of the system Marusur and wait 30 seconds, you will see a group of AI ships spawn seemingly from nowhere. The command station and all but 1 special forces command post have been destroyed already.