Why there is a gap between the concrete deck and the ground?

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i just have a new concrete deck built next to my pool. I dont know why there is a gap between the concrete deck and the ground. is it normal as the deck shirks a bit in winter time? Or the concrete deck is not built properly? how to solve the problem? raise my flower bed that is next to the deck?
q why there is a gap between the concrete deck and the ground, concrete masonry, decks
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