Your experience just might prove my point.
I am guessing that you installed Delta-FL, Dricore, Subflor, or something similar.
That are a plastic wafle with an plywood or osb subfloor over it to which the hardwood floor is installed.
If that is the caes then the moist air can might get under the plastic and condense. However, it is being isolated from the concerete to the wood.
In the wall, unless it is sealed PERFLECTLY air will get behind the DW. The DW helps insulate foundation so that it would be even cooler behind the DW. But then the condensation can wet the DW on the back.
It then tries to evaporate, but place that it is covered up it doesn't.
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