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If this material is fir 1x4 T&G decking ( a common deck flooring) it should not be installed over a plywood subfloor. That is an interior installation detail. It will trap water and rot out in short order. The T&g should be sealed on all surfaces before installation and nailed to the joists with no subfloor. This way, when it is wetted, it woill dry from top and bottom evenly instead of drying on top and staying wet on bottom.
This was not a professional installation if it is as it seems.
Anyway, my question is how to fix these porches. What would need to happen? I'm thinking:
1. Rip up the wood on the top porch
2. Take out the subfloor
3. Increase the pitch (how can this be done? Can you insert a 1/4" piece of wood on the ledger? Or is that a bad idea?)
4. Replace with regular deck wood like the stuff on the bottom porch.
I don't think anything needs to be done on the bottom floor, but maybe I'm wrong, because I'm assuming the pitch should be a 1/4" away from the house too. So, if you have any opinions on this it would be appreciated. Thanks for listening!