Maybe it was in an accident and repaired incorrectly...
FWIW, looks like an easy replacement, here is a link to a replacement seller on eBay:raedana857 I have same exact problem with my 2013 Malibu the dealership said I need a newShutter Grill and it will cost $580.00 it's ridiculous. I just dumped over 1200 this month alone. The car is horrible.