After reading your post, what occurred to me is that it may be simply condensation from the ambient moisture in your home on the cool, un-insulated floor. I do know that there is enough moisture in the air to affect the tightness of the "stretch" in carpeting which seems to change from summer to winter. It's much tighter in winter when the air is drier. Perhaps hygrometer readings over a few days would tell the tale. Just my thoughts.
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........American by birth....Union by choice
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