sound a bit odd,
They are held on by sliding them onto metal pins that are welded to the door.
Best bet it is to take it off and have a look at the plastic back of the strip itself.
To take it off there are 4 screws to undo - one at each end which you can see when the door is open, 2 are covered by little black caps. These ones are a ****** as you need a magnetic screw driver to get them out (i still have one ratteling around inside the door. once the screws are undone, you can slide it off, pulling away from the door hinge - it can be a bit tight.
Good luck