Last modified: 2014-05-31 12:26:42 UTC
When you click the 'x' to remove a section that you've just added, it hides it from the page, but does not remove it from the JSON. This means the section is saved regardless.
Change 81411 had a related patch set uploaded by Mollywhite: Bug 53431: Adjust so clicking "remove" on new sections removes them. https://gerrit.wikimedia.org/r/81411
Change 81411 merged by jenkins-bot: Bug 53431: Adjust so clicking "remove" on new sections removes them. https://gerrit.wikimedia.org/r/81411