I believe they already fixed this bug, but indeed the statistics haven't recovered from the bug except for the playtime bug that had been occuring in Tower Defence and possibly other games (not sure). I'm not very experienced in coding and what not, so I'm not quite sure as to how the playtime could be recovered, but the deaths couldn't. As well as some achievements haven't been working for me ever since.
A brief explanation from someone who knows more would be very nice.