There is a strip of wood on the inside of the hull/deck joint for the screws to bite into, so you might check that to be sure it's not rotted out. If it is rotted, just replace those tapping screws with machine screws, washers and nyloc nuts on the inside.
Those tapping screws don't hold well in glass because the threads are so sharp that they just tear up the glass when there is any vibration or relative motion. If you need to put screws into fiberglass that are not thru-bolted, drill and tap the fiberglass for machine screws . . . they'll hold much better than self tapping screws!
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