This issue only needs to be tested in 1 device. In web as admin, install the choicegroup plugin attached to this issue. I recommend you to install it in a site that doesn't have the choicegroup plugin installed already, I didn't bump the version number. In a course, create a choicegroup activity. In the app, login as a student and open the course. Check that, instead of the choicegroup title, you see a text with a random generated number. Remember this number. Leave the course and open it again. Check that the random number displayed is the same (the WS call is cached). Open the choicegroup. Click the button "Update course page number". Go back to the course page. Check that the random number displayed has changed.