The mystery of the missing stones

Pic 1: Our back fence in the fall.

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Pic two: Our back fence now.

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See the difference?

No?

Focus on the right side, where the fence meets the stones. See it now?

I’ll help you out. Here’s a close-up.

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I have two questions.

Who removed the stones from the bottom of my fence?

(That person-size gap wasn’t there before and no one in my household moved them.)

And why?