Passenger side soaked with rain water

My husband has a 2016 Hellcat. Today we got into it for the first time in about 4days of heavy heavy rain. Lucky us. I found the passenger side carpet soaked with water. At first we thought heater core. But it’s honestly to much water for that. And the carpet under the dash is not wet. Still have heat. And the water is not coolant. Anyone have any issues with sunroof drain? Or windshield seals?? Car has 53,000 on it. Does have a sunroof. There is no obvious source of the water.