water ingress via rear door

I appear to have a twist on my rear door which is allowing water to enter the internal door skin, is it possible to alter the door mechanism to pull it in slightly, or is it better to replace the door seals, which leaves me to believe that the door has a slight twist in it, i can see daylight in the top corner of the door when closed,
any advice appreciated,

Their is adjustment  on  the strikers on outer frame look like ubolts behind plastic  trims Hartel door ,could be a simple adjustment  to pull the door in a bit further.