When selecting the Barcelo memory set in the memory shop, the top row displays the position 1, 3 and 5 while the bottom row displays the positions 2,4 and 6.
When selecting any other memory set in the memory shop, the top row displays the position 1, 2 and 3 while the bottom row displays the positions 4,5 and 6.
You can see the difference in the pictures.