Welcome to the world of wooden floor framing. If you're accustomed to concrete or masonry construction, wood-framed construction can often seem flimsy, but it's surprisingly resilient. Floors that flex a bit underfoot are *very* common. Many years ago, there was a TV commercial for a special kind of floor framing in which a china cabinet rattled when a little chihuahua walked by. Most viewers understood the reference because bouncy floors are so common. Flex in floor framing has nothing whatsoever to do with the floor's strength. If an engineer looked at your floor and said that it's fine, it almost certainly is fine. If the bounce bothers you, any carpenter can add supports to eliminate it. Just don't confuse deflection with strength.
source https://www.inspectorsjournal.com/topic/18825-2019-wrench-foundation/?do=findComment&comment=172267
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