Return to quiz skips slides even before taking the quiz

Return to Quiz is meant to be used for remediation. The command should be triggered by a (custom) Next button on a content slide. That button will have a double functionality: when the slide was reached from another content slide, not a quiz slide, it will act as Next button. When however the slide is reached from a quiz slide, because the user failed that question, after watching the content slide a click on the Next button will return the user to the quiz slide and allows him to correct his answer. He will not be able to proceed to another question slide unless he answers the question correctly. You have to set up the Failure action to go to the content slide on that quiz slide.