All their matematicians are too busy counting every last penny they can squeeze out of the players to worry about insignificant things like probabilities adding up to 100%.
The actual probability table lists the big drop as being 3% instead of 5%. So that 75 shards of each is even rarer than than what the pack description states.
Replies
Get your team of lawyers on it.
There is no need, the +10 shards pretty much settles this question.
Called it
woosh