I hit the bulls eye Pal. Top edge of 80 is bottom edge of 08. 2008 is in the stamper for 9 months, with the lower edge getting hammered a few hundred times a day, with the outer edge taking more blunt force pressure than the inner part. Our postal worker agrees that the stamp edges get crushed, lowering the outer portions of the insert.
What you have not done is explain why the "19" isn't there so you get no brownie points.