Problem with Mappers

I have been doing exercises in Mappers with my child.  My ipad just updated to IOS 12.1.  Now, when we try to do exercises in Mappers, the pop-up keyboard does not fully leave the screen after you input an answer and you cannot move to the next question.  This issue is occuring in both Chrome and Safari.  Since the Map exercises are not in the Khan Academy App I do not have a work around.  Any help would be greatly appreciated.