Lightbox on iOS

I am trying to pop up some pdf files in lightbox windows using your plugin. Works fantastic on the desktop, but on iOS, the popup happens, but I cannot scroll the content in the popup window. This is the site url: http://commercialrealestateinspectors.com/risk-assessment/ There is an accordion setup down the page that contains the links. Am I missing something obvious?

https://wordpress.org/plugins/shortcodes-ultimate/