Synopsis: The planet maintenance screen (building in regions) is unpredictable.
Details:
1. Sometimes, when I click build, the item I had selected to build stays selected. Other times, it gets unselected. For instance, if I pick a factory, then hit build, then hit build again... I suddenly no longer have the factory selected. That particular combination is repeatable. Other combinations are not consistently repeatable.
2. Yellow/orange/red tiles should never be rotated to until all green tiles are filled. On some planets, the "rotation" that picks the next tile to build on goes to a yellow tile. I must either tag it for soil enhancement (then remove that later), or keep selecting other green tiles after every square. Either way, it's annoying.
I don't think these are related; the first happens even on planets with only green tiles, for instance, after the orbital terraformer is available, or before soil enhancement is available. It is very frustrating, because I may have a class 20 planet on which I want to build 15 research labs, and I have to select research lab OVER AND OVER AGAIN. Except sometimes I don't and it just works as expected; I can't say why.
I am NOT talking about the way certain things (starports) can't be built twice.