After suggested edits are approved, the big colored block containing the number of pending edits in the queue disappears. For most users, this is not a problem. For the user who reviewed the edits, though, the block leaves behind one of the dividers that separated it from other elements in the header bar. As a result, the user sees two dividers with nothing between them but empty space.
The empty space in the header doesn't go away until a new page is loaded. I know, I know, it's minor, I'm not arguing that, but still.