In file super_shipping_label.php line 122

Code:
<?php if (($batched == true) and ($batch_item > 1) and (($batch_item % $forms_per_page) == 0)) { ?>
should changed to

Code:
<?php if (($batched == true) and ($batch_item > 1) and (($batch_item % $forms_per_page) == 1)) { ?>
because the page break is inserted one label too early.