The first part of Gleaming Cavern has 11 stars, but when all enemies are defeated only 8 are filled. The scenario still ends correctly, however.
This is what happens when you let the wrong people touch the game. Well spotted. Fixed for the next build!
There are a few more of these on some other maps (iirc), I thought they were in a sort of limbo whilst the missions were balanced, is it also worth reporting if they haven't already been noted in another thread? =O