The problem with this way of installing a roof is that there is no drainage plane for water to make it over the edge of the roof and down the side of the aluminum siding. The rubber membrane should have been cut in such a way as to overlap the aluminum siding on the sides and back, with a fold at the corner. This would have been a good drainage plan. However, the dumb masses at Gulf Stream cut the membrane short at the rear and cut the corner on the membrane. Water has a way of finding its way in, but it generally doesn't defy gravity. The water found its way through the rubber sealant they poured on and the capillary effect took over. To further compound the problem, they installed the vertical aluminum molding up and over the top, which created a dam for water trying to drain off the roof.
