There is a water build-up on the walls. It is usually icy, but when the unit goes into auto defrost, it melts then runs out onto the floor.
The water droplets are inside the unit - on the inside wall.
Then they melt when defrosting and run down onto the inside floor of the unit and out under the front door.
So .... it sounds like you're suggesting that I consider replacing the door seal - is that right?