We found the problem. In QT, under Quick Report/pages folder, in AddPhotoPage.qml make a search to find "debugText" If you search twice you will see a comment to set the debug text visible to false. I have removed the "//" and saved the file. I have uploaded the change to ArcGIS Online. I'm working with AppStudio and everything is now fine.
This is a bug, as you noticed this is purely there to help developers debug the app. This should not have been visible, somehow slipped through. Thanks for pointing it out, we will fix it shortly.