[Kellicus]

I have noticed the same problem. I have just started playing simulatious games and I am not familiar with how everything goes. The retrofitting seems to be the hardest to figure out.
I think, although I am not sure, if a space yard is building something then it will not retrofit a ship. And you can only retrofit one ship per turn at a shipyard. And if we are talking about a planetary shipyard, then the planet cannot be constructing anything at all or the retrofit will not happen.