Why is there a never ending soaked spot on driver side floorboard?

https://repairpal.com/wet-carpet-due-to-plugged-evaporator-drain-462

Wet floor board may be due to the evaporator core drain restricted, a leaking heater core or water intrusion from a failing windshield seal or door seal. The left heater duct issue may be as simple as insulation blocking the air flow or a duct hose disconnected. We would be happy to assist you in repairing these issues at Rick's Automotive. 2121 S Campbell Ave. 417-887-2225