The edge directly under the bubble looks heavily scratched/scuffed and it appears a different tone coloration than the rest of the plastic edge, which suggests

The edge directly under the bubble looks heavily scratched/scuffed and it appears a different tone coloration than the rest of the plastic edge, which suggests a failed buffing to remove said scratches. The edge of the bubble also appears as if there was contact with an abrasive surface, IE concrete or asphalt. I do not believe that this was a manufacturing defect, not after viewing those photographs of the affected area. http://imgur.com/a/PN2CV http://imgur.com/a/PN2CV