Noteworthy spacing problem….

I'm back after trying again.......

I keyed in four measures, the first and fifth and the second and the sixth are identical. When I measure the first and fifth and the second and sixth measures on the computer screen they are the same length. When I print the score the fifth measure is shorter than the first measure and the sixth measure is shorter than the second measure. When I measure the size of the print each charter, lyrics and notes, are the same size. The space between the notes have changes. I feel as I have done something wrong, but what?