I have tested this on a fresh install of both 3.0.3.7 and also 3.0.3.8 and if multiple orders are selected in the 'Order' page and then the 'Print Invoice' button is clicked, all of the orders in the resulting window are correct apart from the actual order number on each individual order are all the same.
This only seems to effect the later OC versions as I have tested on earlier versions which work correctly.
You could either report the issue here: viewtopic.php?f=201&t=225432 and if the issue hasn't been reported on the Github Opencart repository, you could always create a new issue about it.
Dedication and passion goes to those who are able to push and merge a project.
Regards,
Straightlight
Programmer / Opencart Tester
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