4-Card Cycle - Shortest Path to the Same Card

I was looking at a few decks and the 4-card cycle value. In this deck:

  • barbs-5,bomber-2,espirit-1,fireball-4,furnace-4,goblin hut-5,mirror-*,mother witch-4

4-card cycle is listed as 8, but it looks like it would have to be

eg: bomber(2)+espirit(1)+mirror(2)+4 = 9

Am I missing something?