On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
My last GTV used to do this, on both sides.
I ended up loosening the pins under the bonnet and moving them slightly.
The garage that sold me the car, had had the bonnet painted and didn't fit them back into the correct position.
Also look into the holes that the pins fit into. With the bonnet open you should see a shaped piece of wire across part of the hole. Make sure it is sitting across the hole, and not sticking to the side just out of view.