I had a similar problem on my Citroen,with the boot lid up, check to see if the catch mechanism stays still if you push the whole catch system, sometimes the three hex bolts that hold the mechanism will loosen half a turn or so and this allows the mechanism to move slightly and thus push away from the boot sneck. All you need to do is pull the mechanism as far forward as possible and tighten the hex bolts.
dazza1
January 2010