I like the situation-based questions :-) They are easier (to me) than the usual abstract ones.
Those graphs indicate there are too little questions. This test makes you eg. all N based on one or two questions. Which means if eg. introversion was tested with reading, I would be all introvert.
To me, the statistics on HelloQuizzy are cool and annoying at the same time... Cool because I'm a graph and statistics loving nerd; annoying because I can't use this test with 100 fictional characters without spoiling the statistics.