2012 Mazda3 wet floors

I got my car a couple months ago and never
have had any issues with it. Until about a
week ago there was a big rain storm and I
went to leave for work and my car was
parked in an ankle deep puddle. I thought
everything was fine until a couple days later I
started noticing my car smelled like wet dog
and I got in my passenger seat and my floor
was SOAKED. Both my passenger seat and
the rear floors were both wet. I took it in and
the mechanic looked over my car for over an
hour, cleared out the ac drip tube, checked
the door seals, checked the heating, and
said he believed it was the drip tube that
was clogged and actually emptied itself onto
my floors. They said I shouldn't have an
issue again. Well this morning I got in my car
and realized my floors were wet yet again. It
only happens when it rains. And it seems to
be only the very bottom of the floors, the
portion of the flooring that curves and
connects to the body of the car is bone dry.
My car does not have a sunroof, there are no
wet spots on the ceilings, and no moisture
on the seats. It's solely on the very bottom of
the floors, and not the drivers side at all. I
contacte the dealership and they were of
zero help. I got under my seats and stuck my
fingers in the air vents under my front seats
and sure enough they were wet on the
inside. Someone please help me figure out
what on earth is going on.