You need to refit the tailgate.
Make sure the part of the hinge that bolts to the tailgate itself is properly secured. There is a "leg" on it and a bolt that secures it, hidden under the rubber seal.
Clean up the roof and the gasket that the hinge sits on. You'll need a non setting putty... "plumbers mait" (not silicone) to seal the holes in the roof where the bolts comes through. Don't tighten up the bolts yet.
You need to put some packing where the tailgate closes onto the lock, I used some folded cardboard and a bit of trial and error as you want a nice smooth closing action without the tailgate rubbing on the lock as it closes. When you're happy with it, keep the tailgate closed with the packing in situ and tighten up the roof bolts. Remove the packing and you should end up with the tailgate closing correctly and the hinges sat firmly in the gaskets.
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