leaky back windows??

i noticed on sunday when washing my landy 90 that the rear sliding windows the water was runnin in along the bottom of the inside of the window,,is this normal or can i stop this happening?ta rich

Had same problem and water was drippin inside onto wheel boxes so far have managed to cure it by injecting black sealent into frame on the inside at the bottom of the middle post on the fixed window side as the seals dont come right up to the end of the channel causing water to pass through from the outside. Granted you will get water through the rear windows when washing as the seals are pretty crap anyway but i was gettin flodds when it rained