Nestle KitKat Pumpkin Pudding

Nestle is bringing back a seasonal favorite for Halloween. As it states in the copy "both kids and adults love pumpkin pudding", so that is the flavor for this holiday. There are 13 individually wrapped chocolate bars per package. Although not shown, there are 6 different Halloween designs for the small individual packages. Nothing wrong with this, but it does sound a tad strange. Since there are 6 designs and 13 items per pack, which means 2 each of 5 designs and 3 of the remaining design? Sounds like this would add unnecessary complexity to the production process, but I suppose Nestle knows what they are doing.
ネスレ キットカット パンプキンプリン
https://d.nestle.jp/kitkat/limited/9416338.html

Photo is a web capture for explanatory purposes, copyright belongs to the company.