The Kostura cannon is bugged when you fire on planets that have TEC starbases with red button. I was playing as TEC myself, and [DT]Tyr222 was playing as Vasari. After kosturas made impact on the planet with the starbase, i moved in to mulch it down with my fleet. feeling confident, i saw abilities disable appear on the starbase.
HOWEVER, no more than 5 seconds after kostura impact, the starbase regained its abilities to use the red button, BUT, all structures did not regain the abilility. this has to be some sort of bug, and i have a replay for devs to look into it.
http://www.filefront.com/15457193/AutoRecord-01282053.record
its towards the end, you will notice my fleet (pink) on Dead Rats homeworld where there is a TEC starbase owned by {SB}Boom. please note kostura impact, then red button usage.
thanks!