Hello.
It seems that some missions are not added in some solar systems/constellations’ total number, even though they appear as they should on planets.
Here’s an example:
Even though the planets’ missions add up to 21, the solar system shows 18.
This affects a lot of solar systems, for example in one constellation(Minyas) where I have completed every mission, from 18 solar systems only 8 are shown as completed.