[Wolfman77]

I was playing AIC last night and I ran into a situation where my homeworld cultural centers started disapearing. It happened several times, usually 1 or 2 each time untill they were all gone. One turn I noticed I had 4 left, when I attacked a damaged enemy ship in my homeworld sector, combat started with 2 of them damaged, before I clicked to begin combat. Then with 2 left, I went 2 more rounds without any combat and they were gone. My population mood was anywhere from happy to angry, I had my resource storage at or near max and was using only about 200 each turn to build. Is there something in the building abilities that would make them dissapear?