The only slight short prints are found in rows not repeated a third time on the sheet.
A double sheet consists of seven rows on each side. A series (modulo any double prints) takes up three rows. So the bottom row on each side is a third repetition of either the first or second row. In other words, if you call the rows A,B and C, the sheet looks like this:
A A
B B
C C
A A
B B
C C
A B
Thus, the C row appears only four times, while the A and B rows appear five times. Not a significant short print, but a very slight one.
But as Greg Grant has observed, the more sets are completed, the more significant that slight short printing will become.