Do you have a weather strip on each of the doors at all or is this what you mean in terms of rain deflector? This is a small strip that goes at the base of the door and prevents any rain water that runs down the face of the door from running down between the door and the frame and entering the room space.
It maybe that rainwater/moisture is entering the summer house this way?
Can you see where the water is entering at all as this may highlight where the actual leak is
Hanging the doors so that they swing outwards may help the situation as you can then add a lip to cover around the outside of the door. You can then have a seal that runs around the inside of the lip that that covers the gap between the door and the frame that touches the frame to ensure that no water or moisture can then run down behind the lip and enter the property
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