Technical Documentation Page

I’ve just completed the Technical Documentation Page project and I keep getting the error that content with spaces should include and underscore ( _ ), even though my code fulfills those parameters, I still can’t pass the test. Assistance would be appreciated.
Here’s the HTML codepen:

This is the test you are not passing:

“Each .main-section should have an id that matches the text of its first child, having any spaces in the child’s text replaced with underscores (_) for the id’s.”

Look at the first .main-section. The id is one_six. The text in the first child is One to Six. Does the id fulfill the requirements of the test?