If you look at the item information screen, nothing indicates that these cost fleet credit and it even shows a value in EC. Not too far-fetched to imagine that someone could (way too) easily not realize that they cost FC, especially since everything else in the replicator costs EC.
Now I'm a little pissed. Granted it helped my fleet, but not very much. On top of that, I just lost a quarter of my credits I was slowly accumulating. I don't get to play very often and was working my way to some cool new toys. Now I get to wait even longer thanks to Cryptics lack of communication and crappy ideas.
Yeah, thanks a lot Cryptic, this really makes me want to play tonight.