[DirectorTsaarx]

Did you build the "phantom ships" at that planet? Or did you just load up fighters there?

My guess is that the .gam file didn't clear everything when updating turns, and you didn't notice for a while. Not certain exactly how it would happen, since I don't know how the .gam file is generated, but this is a fairly common problem in programming. Back in my college days (the Last time I did any serious programming), I was always finding places where I'd forgotten to clear a register or reset a variable. I'd say definitely send a savegame to MM with a description of the bug. If you have a later turn where the "phantom ships" have completely disappeared, you might want to send that too...