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Its typical cheapness on the part of ford. They paint the plastic rather than mold it in diff colors just to save a few bucks and did a crappy prep job or used inferior coating so now its peeling off - probably from uv exposure.
If its under warranty take it to the dealer - if not either prep and paint yourself (you cant do worse than the factory did) or buy new parts and install yourself. They are not difficult to remove/install and I am sure the dealer will overcharge you on the labor.