What could be the problem???

[bobthebuilder01]

What could have caused this mess? Is it an easy fix?

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[Brandon Whitmore]

Judging by the disconnected or damaged drain in the last picture with a crack in the corner, I'd say the drainage issue caused it.

[kurt]

Yes. Freeze/thaw heaving.

[Rob Amaral]

Jack Frost... due to poor grading... He comes every year, moves it a bit and doesn't put it back... (Or, Jane Frost...