Power craft calculation

Just wondered how the required stamina for power craft is calculated. Just saw the following on one of my heros which definitely seems wrong:

Crafting skeleton dance would cost me 3192 stamina, while the individual badges only cost 1158 + 996 stamina. Which is about a 1000 less

Can it be because of smaller badges? I don’t remember, but maybe Darkwing mask and Fred’s shorts share some resources.
P.S. Just checked, my mistake, no purple badges share same parts. Actually, the game offers me to make skeletons a bit cheaper than ukulele and the brush :thinking:

I checked all my resources and they don’t share a single one. Scrolling further down reveals I’m actually only missing 2 badges: ukulele for 996 and Fa family shears for 1158. Some how higher up an extra 1000 is added for no clear reason

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