Answered
I created the following activity with some questions in it:
https://www.geogebra.org/m/asbw7qdg
When you get down to the multiple choice questions, they seem to be "scored" incorrectly if "try again" is clicked. I have the correct answers checked on the left when I created the question. However, there is a strange set of check marks and x's that appear if you try and press "try again" is this a bug or am I missing something? I can't seem to find any help in the forum.
The same question 
It looks they're working properly, but you're expecting to behave them otherwise. In controlling multiple choice questions one can take two possible options: to show all the right answer(s) or to check the options a student has made. I guess you expect the first option, but GeoGebra takes the other one: If you didn't check a right answer, the control will mark the answering as wrong and if you didn't mark a wrong answer the control will mark it as correct. Briefly, every choice of the student is controlled.
chris
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