I'm not sure if this is the correct place for this but I've been coming across this quite often now (twice in the past two days) so thought I'd put a post in here too.
I've been levelling a new character and with the way missions are handed out I come up short at each grade so have to head into the nebula's to run exploration missions to get to the next tier. Both times I've done this, last night and just now I've come across these guys at the back of one of the chambers;
I've got no way of giving the exact name of the map so I wrote a bug report which IIRC gives more details on the Cryptic end than I have available, the report number is;
There are a few maps with ramps, the one I see most often is what looks like a Fed base, the ramp is high enough that the lower section of themap disappears on the minimap as it's so far below; usually it has a really tough Captain fight at the end so I'm always happy when I see that map.