There are lead edge settings on the EnPress. They are performed on a thickness setting and can vary with different stocks. If this is a small print run and you don't perform it regularly, I recommend printing one side at a time and just use the imposition setting in iQueue to adjust it. Should you feel that you are confronting this issue frequently and wish to adjust this so that it will print the same going forward, I am attaching instructions how to do so. When I did this I wrote on each test sheet what the setting was, etc, to keep everything straight and recorded the default settings the EnPress was shipped with.