Edit: it's not wet by the door card but maye it's running under the carpet and collecting on the middle
This is what happened on the Leon me and Dave pulled apart the other day
The sealant had gone at the bottom of the metal regulator panel so instead of the water being channelled out of the door drainage holes it would seep in, sit on the sill and then soak into the carpet
Whip off the door card and watch for water coming through the bottom
I also think its the source of my leak although it hasn't gotten any worse
