Cannot return to Curriculum map from section intro page

[mstellaluna]

Challenge Name
Not Challenge Specific - it originates from the curriculum map - section introduction pages
(eg: https://learn.freecodecamp.org/responsive-web-design/applied-visual-design )

Browser Information
Browser Name, Version:
Firefox Quantum 60.0.1 (64-bit)
Chrome: Version 66.0.3359.117 (64-bit)
Operating System: Windows 10 Pro 64-bit
Mobile, Desktop, or Tablet: Dell Latitude Laptop (15")

Issue Description:
From any challenge if :

1. Select the 'View the Curriculum"
2. Select any main section (not the lessons), it brings me to a introduction page for that section
3. if I made a mistake, I can't get back to the map. I have to select a lesson to get the 'View the Curriculum" button back or use the back button on the browser to get back to the last lesson that was accessed