I have been using 6 since the first beta versions and one thing I have noticed is sometimes they show up, sometimes they are misplaced and sometimes they are not even there. My rough guess that this may have something to do with the accuracy of your location seed, and the algorithm they use to place stuff around where they think you are. I would imagine they factor it in for error correction and maybe when they get a less accurate seed, it throws everything off. It's a wild guess but based on my limited observation it seems like something like that is happening, some times it nails it and sometimes you get a WTF. I usually just do another search and it clears it up, but that only works if you know what you are looking for, which is my general use case for maps.