A structural engineer won’t provide comment or answers for you related to an improper floating floor installation. They’ll just hedge and nod politely and ignore you because it’s Not Structural. They’re also very, very careful to comment only on things within their classified expertise. A buckling floor installation is a problem for a basic handyman or you back you your flipper for a flooring install warranty claim. The floating floor is not “the Floor” just like makeup is not your actual face; it’s just on top. The hills to you, which you identify are imperceptible to everyone else- are either weather related expansion, acclimation, or just bad install.