We have this strange issue with a scorm on iPhone. When scrolling up and down the background color blocks out some content however this is reset when using the swipe right/left on the scorm.
In the video the background colour is black and when scrolling up and down content and scorm navigation buttons are blocked by this. I have tried to check the slides and there are no invisible elements that are popping up.
I am not a developer of scorms but I have tried to change the background colours in the html5 file to transparent but nothing has worked.