Its most likely that your door membrane is letting the water in, remove the door card, and check that its in perfect condition..
door and window seals are never a perfect answer to water ingress, thats why doors have drain holes, and membranes!
Sometimes its easier to replace the membrane with good quality polythene sheeting, and spray adhesive, taking note to cover all the holes on the inner door frame, as per the original, a good fit is the key here.
Thom
