"Retake Course" issue

Hi community,

I have a "retake course" button at the end of my courses (the trigger says "Restart course") in case learners want to go through the material again, but I notice strange issues tend to occur sometimes when taking the course a second time using the 'retake course' button (such as an arrow button to go to the next slide not working, or text on the base layer showing through on other layers when they didn't on the first pass (and shouldn't anyway based on how I've designed the course).

For today, the problem is this: I have a knowledge check at the end of one of my sections in a course. When a learner takes the course the first time, they're able to complete the knowledge check and click Submit in the bottom-right corner with no issues. However, if they click "retake course" at the end of the course and go through the material again, the Submit button disappears on the knowledge check slide and is replaced by <PREV  NEXT> buttons, except the NEXT> button doesn't work, so the learner is stuck on this page. I've been able to recreate this on my end several times now.

Any thoughts on how to fix? Should I simply remove the "retake course" button from the end of my courses to avoid all these random issues, or am I missing design steps when implementing this button using the 'restart course' trigger?