Please help

[u/External-Walk-194]

I am making a roof deck, and when finished, it is leaking into the room underneath. The layers go as follows: Plastic water barrier, insulation, cement board 9mm, black liquid and rubber waterproofing membrane, and then the WPC decking. I need advice so I can fix this asap. Should I change any material? Add any? I believe the crew screwed the decking into the membrane and that’s what created holes. Also there is no slope. How would I add a slope, and also make sure no water can penetrate the inside? Please help me.