Taking a look at the lootbox page here:
https://wiki.spiralknights.com/Clockworks_Prize_Box_Promotion_April_2026

It looks like the probability is off? there are 7 groups of items w/ probabilities of 1, 2, 2, 5, 50, 25, and 24% chance of acquiring those items, but adding those chances up comes up to 109%?