Interior water leak problem

[ilikeching]

I just removed the driver side carpet, this was from previous owner(just purchased a 97 few months ago) must have been there looooong time..........
i noticed on rainy day, it was soak wet at the door side panel, bottom front of driver side, under the speaker. i opened inside the door panel, it was dry.
checked the drains behind the seats, it was ok.. just quick test front drain hole, there was ok..
There is no problem on the passengers side.

any ideas?