Tracy Allott gets same question wrong when right same issue again, is this a bug?

Before I said how on a Swedish course the score marked me as not getting answers right when in fact I was getting them right and the green light showed behind my answer to show it was correct. Then when I put this question on forum and said also was I then over-rated, you said do not cause offence on forum as I recall. Now I refresh the introductory Beginner’s Spanish course and again they keep throwing thet same 3 questions and when I get them right the green light shows on the answer bar, but the score at middle screen top says not correct. I do not know who is doing this, it seems like a hacker or someone not wanting me to get them right> or a computer blitch.