Did they (Team Riess*, WMAP, PlanckSat) all look in the same place? (Yes I know, they all looked at the ovservable universe, duh.) The point I'm trying to make is: the universe might not be expanding in a homogenous way. Some parts of it may be travelling at other speeds than other parts, so to speak. After all, the observable matter in the universe isn't distributed equally/homogenuous; it seems the Big Bang didn't create a perfect sphere of expanding spacetime and matter but something a bit irregular and, in search of a better word, bubbly.
* Adam Riess - I always read that as 'Adam Riese' first, and keep having flashbacks from my time in primary school. Is it just me?