I think I found the problem. You get a text box on top of another if you click (instead of Continue) either blue or green area again when the pop up is open (meaning not the base layer, but on those additional layers). There is no such problem with yellow area.
The additional text box seems come there because those blue and green areas on the additional layers have "Visited" states that for some reason have an additional text box in them. This might part of some previous version of the slide that you left in there by accident.
Thank you so much! This helped me figure out my problem :-)
