This doesn't appear to be an issue, but a setting that needs to be configured when printing. However, there might be a few causes to this issue:
- the labels are too big to fit only on one page (if one label uses more than 50 % of the sheet, the next one will be printed on)
- the format used to print is wrongly configured in the layout section. When printing, go to Print Preferences > Layout and choose the correct paper.