This how not to fasten joist hangars and band joists on a deck.
I guess thats also why you aren’t supposed to use a hammer to drive a screw.
In that first pic, are those electrical wires running along the bottom? Looks like they’re not secured or rated for outdoor use.
Looks like phone and cable…
Phone & Cable
As they say, “When the only tool you have is a screw gun, every problem looks like a screw.” :mrgreen: