Hi, thanks for the kind words!
Actually, that was one of the really hard design decisions. I originally designed the levels so that the opposing sides had to add to 7, but in the end I relaxed the requirement as I thought it would be too hard to explain. So you can arrange the faces in whatever way you want.
In retrospect, I should probably just have given an award/achievement if all your dice were correct, and a challenge prompt if you completed with slightly weird layouts.