Can you attach the DB here?
i can try.
That worked. I was able to open the game with your db and take a look around.
Unfortunately, I don't see any obvious explanation.
My only thought about a possibility:
1) A CGK ship (a scout, perhaps) had been in Epsilon Indi. (This seems reasonable, because the "Known Systems and Populations" list for the CGK includes Epsilon Indi--at some point you (or perhaps an ally) observed a CGK presence there.)
2) That ship jumped into McCormick 541.
3) The allied VER fleet that is parked on that JP saw the ship.
4) Since VER are allies, they alerted you about the CGK presence, but you don't see a contact because the CGK ship is not within range of any of your own sensors.
With #4, I'm only guessing. I'm not sure how contact sharing with allies works.
Perhaps someone familiar with those mechanics is reading?