I'm having a bit of difficulty with a few of my multiple response questions. Each of my question slides has a "Correct!" and "Incorrect" feedback layer. When previewing the course if only a single response is selected, or the wrong combination of responses selected and the submit button clicked, no feedback shows, it just advances to the next slide. If I select the correct responses, I receive the "Correct!" layer feedback. All of the single response questions give correct or incorrect feedback properly. Is there something easy I'm missing that needs re-linked or changed?