I see you edited the post to include your question, thank you for that. Can you post the link to the challenge here? That way we can see what the exact requirement for the challenge you are on
The problem is that you inserted the section yourself by placement of the opening tag and the closing tag
opening tag - opening tag -closing tag - closing tag will put the second section inside the first.
opening tag -closing tag -opening tag - closing tag will put one behind the other
I also made the error you made when I was in Cat Photo App Step17 and I thought I was right.
What you need to do is reset the challenge and insert the second section after the first section’s closing tag.
Hope it works