If you've experienced any difficulties with printing labels, please check that you do not have any scaling or rotation on your printing. The labels will fit perfectly to Avery sheets at 100% and does not need to be scaled up or down.
Please check you have:
1. Unchecked the 'Fit to page' option. You do not want to 'fit to page' as it will add extra margins. The example below shows how it might appear if you're printing from Chrome.
2. Make sure you always have A4 selected as your paper size: