I'm getting 1/2"-1" of water standing on the floor as far forward as the console in my center console boat apparently coming from transom/bilge hatch area after a few minutes at stop. I suspect the two drain exits at each end of the transom. These have rubber flaps which are supposed to keep water from re-entering. Could these flaps be malfunctioning. The hull drain plug is tight and secure and I can't find any cracks or hardware that could cause this problem.