Hello all. I am a new owner of a home with hardwood floors. The floors are about 20 years old and are in great shape. Recently, we have found moisture damage, mold, stains, popped boards in several different rooms of the house under something sitting on the wood. It seems to be where a plastic storage bin or something broad and flat is sitting directly on the wood. This has happened in 2 bedroom (under the beds) and 2 different closets (under plastic storage containers).
Is this normal? Should I not allow something to sit directly on the wood? Does this mean I have a leak somewhere? I live in Florida and my inside RH is usually around 55-60% year round.

Any help would be great! Thanks

A cold floor in a home with warm air and high humidity can cause condensation which may be your problem, among other things. A poorly seasoned slab, spills or a leak may be causes. A moisture meter will help find the cause. You can buy one that has two probes that measure how much moisture is in the flooring at the depth of the probes. You will need to fill the tiny holes caused by the probing with colored wood putty so check in several areas that will not be exposed.

If you have a basement or crawl space your problem could be below.