Well, you still have two sidebars on the right. What’s happened is that the first sidebar doesn’t have any widgets in it, and whenever you have an empty sidebar, WordPress automatically sticks a meta widget in there. So there are a couple of things you can do:
- Add a text box to the first sidebar but don’t add any content to it, leave the title blank as well. The empty text widget should make the meta widget disappear.
- Use some CSS to hide the first sidebar. You’ve already activated Jetpack’s custom CSS, so go to Appearance → Edit CSS and add this rule at the very end of the CSS Stylesheet Editor (after line 5):
#secondary {
display: none;
}
The second option is probably a bit “cleaner”.