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Moisture can condense on anything cold and concrete, if it is exposed to the exterior, certainly qualifies. It’s not hard to get condensation inside wall structures. Vapor barriers are funny things, they need to be in different places in the wall, depending on where the higher humidity is and what side of the wall has a lower temperature.
One test we would always do on a concrete slab to check for moisture ingress was to tape a piece of clear plastic down onto the floor and see if moisture accumulated inside it over a period of a few days. Easy to do, you should try that in a couple places. I would suggest one near the outside wall, or close to wherever the moisture sources might be.
When you mention the smell, you described it as moisture and not mildew. Wet concrete gives that odor.
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