[BUG] Working with Light Course stops rendering and glitches out

**Bug Description:**
When you do the Working with Light course on MYR, it works up until the step that says Indicator (2/2). If you progress past this step, then come back to it, every step will then be glitched out.

**Steps To Reproduce:**
Steps to reproduce the behavior:
1. Go to [learnmyr.org](url)
2. Click on 'Courses'
3. Scroll down to 'Working with Light'
4. Keep clicking 'Next Lesson' until you reach 'Indicator (2/2)'
5. Click 'Next Lesson', and then click 'Previous Lesson'

**Expected behavior:**
The course should go on as the code is written, however it keeps the light from a previous lesson and stops rendering the code entirely.

**Screenshots:**

**URL(s):**
[https://learnmyr.org/course/light](url)

**Desktop:**
- OS: Windows
- Browser: Chrome