I would say they are traveling, I had a few show up with an error above them stating that and they show a blank location. I found this on a few droids aswell as a few items.
This is the error from the droid page, the last droid info is blanked out.
An error occurred: Undefined property: Droid::travelClass
Hope this helps.
Galain Quin
Edited: The error is from the K-4 Security Droid page on the market