Quiz questions marking as incorrect even though they are correct
I have a course which has 10 questions at the end and in all the testing, the scoring works perfectly. However, since launching, there are a couple of people who have tried to complete the course and on one question it repeatedly says they are answering the question wrong and taking them back to the same question. After redoing the same question a few times and answering the exact same answer, the test finally says correct. There are about 4 people out of about 800 who have experienced this issue and I can't replicate the error in testing or on our LMS even using different browsers.
Could this be a glitch in Storyline or their browser? Or could I have missed something? It seems strange that so many people have completed the course without any problem and others have got stuck on this one question.