wagon tailgate condensation excessive

[nictriumph]

hi all

after all this rain weve had,i noticed that theres alot of condensation on the tailgate of my wagon...have i got a problem or is it normal? cant see how,,theres alot of water droplets even soaked carpet

im thinking if its the rubber seal that gone soft and not sealing up to tailgate when closed

any other members having or had the same problem

 

thanks nic