This is the link to the converter.
http://www.yeecoconverter.com/index.php?main_page=product_info&products_id=145
Nothing else connected literally just connections from DC supply -> converter -> arduino. Even in this simple setup it is the same result. I have tried breadboarding all 3 to the same ground bus rather than +- potential pins still the same. I have a feeling there is something weird in the logic of the boost converter when arduino is plugged in?