The last time a Guardian told me they were missing a Ghost that wasn't Darnkess 3, they were also 100% sure they picked up all the ghosts. I directed the Guardian back to the spot, and they found the missing ghost. If Ghost Fragment: Cosmodrone 2 is glitched, then you are the first one that'I've heard this affecting. When was the last time you went back to the ghost? http://destinyghosthunter.net/ghosts/psn/cmonkeydew/earth/