Air pressure could be forcing water through an otherwise tight seal. With a leaf blower on low power try seeing if you can feel air flow through a seal. Also, at night try a strong flashlight up against the seals and look for light coming through. If you have not done so, inspect the seals. Even a tiny twig, torn gasket and similar will allow in water in a storm. With enough wind speed water will travel up under your slide so check the gasket there also.
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