Some scores aren't correctly calculated.
ex: The select question allows a score of 20/10
This happens when all options are chosen even though some are not correct.
The score of those incorrect are added eitherway.
ex: The multiple choice allows a score of -10/10
This happens when the wrong choices are set with a negative score and overpower the positive scores.
I don't know if this is a bug or not.
It might be that some people would like this but then it might be a good extra option.
I suggest leaving the possibility to set negative scores, for guess correction.