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Actually, that problem is fairly common on these 21's, both the "Ribside" 71 and 72, and the 73-80 "Smoothsides".

The hulls can leak slightly at the joint, especially in the stern near the water level, where the topside mono casting is glued to the hulls foamed slab casting that actually forms the hull. This joint is covered by the rubrail on the outside.

It is easy to fix a seepage problem like this. Using a product like "Lifeseal" simply caulk the joint on the inside up to about midships. That will fix the problem.