Anyone experienced an issue with a door retaining water inside it?

What is your question?

Car stored in garage...excellent condition. No outward signs of deterioration where water can enter doors, but got heavy downpour...started hearing water slosh on passenger door. Next day I ran my finger between rubber gasket on bottom of door and water poured out of holes in bottom of passenger door. What's up? No visual evidence of any problem upon close inspection. Concerned of what damage can be done by this problem beside rusting.