Some of my guild mates mentioned that as well. I don't know if they were messing with settings or if they reverted the megaserver there. It could also be that you just happened to be placed in a "fresh" instance (the others just recently filled to max, prompting a new one to be made) and there weren't enough people to fill that specific one out. From what I've seen so far in different zones, each server instance doesn't appear to be filling out evenly. They seem to be just packing one and then making a new one, basically like the overflow system was working. So it's entirely possible you just got stuck on a newly created instance. Though there's no way to really know for sure what's going on because ArenaNet has been completely silent on the issues people are bringing up.