If the edges of the wood cups up it is moisture from below, if the center bows up than the moisture is from above.
How long did the flooring sit in your home before it was installed? It should have been in there at least 3 days at room tempature.
Was the moisture content of the sub floor and the hardwood checked? If it was not at 6% you will have problems. Was the heat maintained once installation was started? Is the floor now finished?
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