15 tone Kinkerland music strips

Hi, I just recently purchased the 15 tone kinderland music box as a gift and printed a couple of music sheets from this website. I noticed the width of these printed strips are slightly smaller than the music sheets that came with the music box. I exported as a4 and printed at officeworks. The issue im having is that sometimes my sheets get misaligned while cranking and notes are off. Has anyone else had this issue and could suggest a solution?