If that's true, then why did I get a repeat on one of the missions I completed, but not the other?
I've had the repeat for the Regnant Station mission, but not for the escort mission which I completed a bit over a week ago.
Well as far as I know there are only 3 weeklies. 1 for Regnant Station, 1 For Thanium Disruption and 1 for Thanium Disruption + Baros Ambush. I have not seen any weeklies for the other 3 missions. So there either are no weeklies for them, or it may indeed be a bug if there are supposed to be more than 3 weekly space missions.