How is it possible that 2 plates had the same text and were accepted within 2-3months of each other? There are a ton in the accepted file that are equal to eac

How is it possible that 2 plates had the same text and were accepted within 2-3months of each other? There are a ton in the accepted file that are equal to each other. FTG for example was accepted on both 6/18/2013 and 8/27/2013