Why Are Composite Deck Boards Curling?

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I have a deck that's about 25' square.  Last summer, I installed composite deck boards to it.  By springtime, the ends were curling up, the joints were spreading apart and the boards were shifting.  The semi-hiden fasteners went into 3/4" plywood. The manufacturer is not helping me with this problem yet.  I don't know what went wrong. Can you help me?

                  Thanks,   Bob

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