When adding a layer to a label to create a second page.
This seems to have an adverse effect where each time you then go back into a label and this doesn’t need to be the same one.
This layer seems to have been added to the other labels. So each one would print an extra page. This then happens, again and again, each time you open and close the label for editing.
Even after removing the layer (See above), the issue still persists. Even if you click no to save possible changes, this seems to still take effect and you’re left with a page that you can’t remove as the layer now does not show.