Golf V R32 :: Front Bumper Expand While Parked Under The Sun For A While

I noticed while parked under the sun for a while the front bumper expands, fully exposing the small cut outs or tabs usually hidden under the head lights. I brought it in to get checked out and being told that every clip and screw are in the right place. Later on that day I met with the mechanic, he explained that the bumper is a little different as far as mounting goes compared to other vw's leaving a weak spot.