I'm guessing that you're asking about a DLC mission for ME 2. I've never played the DLC for that one, so I wouldn't really know. It's possible that it isn't a bug, and that there is a trigger you must activate to end the spawn or to escape, but I'm only guessing.
This section is more for assistance with the forum itself. The ME 2 forum is surprisingly active for a game of its age, so you shouldn't have too much trouble getting an answer in there, where there are likely to be readers familiar with the mission you are having trouble with.
You could message a moderator to have this thread moved, though it would be faster to self-report the thread asking for it to be moved, or even faster if you recreate it in the ME 2 Strategy section linked here.