Thank you, for playing and leaving comments.
Dice don't add up to get the number of moves, their added value is converted into a predefined number of moves. (1-4 -> 4 moves, 4-8 -> 6 moves, 8-12 -> 8 moves). This is basically to have more control over how many moves you get, for instance, if you roll snake eyes you get at least 4 moves.