After playing for a few hours with a certain mouthpiece, I remove the reed carefully and check if the table is dry. Lately I have found a very nice playing mouthpiece but after lifting the reed, I see that the humidity (saliva) goes a bit through the table beyond (below) the window. I've tried with many different reeds and it was the same thing. Is there a problem or "side effects"? Up to which point should the table be sealed by the reed?