The issue is that the new sections are nested inside the last (smaller) column, inside the previous row. You'll need to move them from inside the previous column and row, and into a new one entirely.

Hopefully this shows what I'm talking about, where the highlighted section starts and ends, you'll need to take the new section from there, and paste it after the last </div> highlighted here. It also looks like you may have accidentally deleted the last </div> that enclosed that tab, so I believe you'll have to add in another at the end of that tabbed section. Try to make those changes and see if it fixes the issue! If you're still having problems, just let me know and I can try to fix the code myself if you can send me a text file of the edited version.