HI Zubeida!
When a learner clicks the "Retry Quiz" button, they'll be taken back to the first quiz question, and the quiz results will reset. They'll also see any non-quiz slides that appear between quiz questions.
However, you mentioned some questions are skipped when a learner attempts the quiz a second time. Are the skipped questions in a question bank?
I completely understand you not being able to share your file publicly, so we have an option for you to share it with us privately by clicking here. If we can take a closer look at your file, we can try to nail down why some questions are omitted from the second attempt.