Too many things happening in too many places during rain. Makes you guess which one of too many possibilities are the reason. Need to cut the potential sources into manageable parts.
Use a garden hose on one small area at a time.
Or cover a wide area of the glass (from top to bottom) with plastic. Next heavy rain will let you know if the problem starts with ground water rising up, or if 100% dry it has nothing to do with the ground level water.
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