I just acquired the 4 Queens set of 4 Fourth of July Stackable Chips. And there is a problem. The four chips are all different--Navy, Air Force, U.S. Marines, and Army. But--they don't stack! The Marine Corp. Chip and the Army Chip are both labeled on the side "1 of 4". They both fit the "stack" perfectly on the top. But there is no "4 of 4" and the bottom of the stack is an incomplete picture. My question--is this a common problem with all of the July 4th Sets or is my set an "error" set? What experiences have you all had with this set of chips? Thanks for any feedback. Doug