Villagers sometimes kill the wrong sheep

Context: During the Feudal start, I've lined up my sheep under my TC, and shift-clicked through them to kill and collect them in order.

Sometimes one or two of my villagers will ignore the command queue and just kill one of the other sheep instead (leading to lost food :( )

Why is that, and what should I do/avoid doing, to prevent it from happening?

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The animal wandered too close to a building, a cliff, another resource (tree, deposit, etc.) or the edge of the map before it died. ...

There are too many villagers gathering from the animal, so there's no free spot left next to the carcass.

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