[Cyrien]

I've seen that as well. In my latest game where I waged a war of total extermination against the EEE.

So I built star destroyers and mine sweepers sent them in and blew all their stars away.
Was using the FQM standard mod and noticed something... the moons were changing sizes from what they had been and what they became when I used stellar manip to make new planets. First I thought this was a bug based on using stellar manip to create planets with moons in orbit. This wasn't the case. When they were blown up it seems that there sizes changed. I can't say if all of them changed or just some of them... but I know at least a few changed in size because I had certain ones sized up from before hand as being tiny or small sized and afterwards they were large or huge.

Same game I got a planet/asteroid belt to dissapear by double clicking on create planet and having it run the animation twice and eat both asteroid belts but only make one planet. Seems that moons react strange to stellar manips of various types.