Geth Consensus?

I'm attempting to take down the Geth Fighter Squadrons by destroying their server. They give Shep a gun, and have him "delete" faulty programs on this walkway that leads to the central server. Halfway through, there's this part of the "walkway" that I'm supposed to destroy, just another "faulty program" like those I had destroyed before, but as much as I shoot it, its not going away. I think its glitched, which means the mission might be bugged and possibly unable to be completed. Anybody else having this problem?

I finally got past the first part to the main server. Now I'm in part 2, I've rounded the huge data hub and reached the edge. Even though I've destroyed every bit of Reaper code around it, the red tiles still won't go away. And the nearest codes are too far away to zap.