Hmm. It does not do it for me in any desktop browser. That makes it annoying to debug. 
When we implemented these question types, we did test on mobile devices. And the quiz on qa.moodledemo.net is working fine on my iPhone. I don't have an android device to test with.
When we implemented these question types, we did test on mobile devices. And the quiz on qa.moodledemo.net is working fine on my iPhone. I don't have an android device to test with.