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I'm assuming you didn't shift or remove the hood? Try seeing if you accidentally lock the latch before putting down the hood, if you lock the latch before the the shutting the hood it will just keep hitting the latch, I'm not sure why would a grill would cause the hood not to latch. Second, try seeing if the hood latch in the car isn't stuck causing your hood to stay open, update us when you find the problem.
would the weatherstripping above the grill could have caused this if it was re-installed facing the wrong way? Not the wrong way meaning upside down... All of the "clips" snapped in place...
Originally Posted by liqB
Can you take a pic of your install, maybe we can spot the problem for you.