Assessment wanted for Structuring planet data - SaulWD

Hello, I would really appreciate it if you could take a look at this Structuring planet data assessment.

Assessment page:
MDN Web Docs - Assessment: Structuring planet data

My code:
Codepen.io - Assessment: Structuring planet data - SaulWD

I ran my code by W3 HTML checker and got the following error 10 times:
“A table row was 12 columns wide and exceeded the column count established using column markup (4).”

And this one 1 time:
“A table row was 2 columns wide, which is less than the column count established using column markup (4).”

Please let me know if my HTML code is written properly or if it requires fixing, thank you.