Okay, Andrew, I'm not sure if this will fix the problem, but at least let's see if you have something squared away.
I once helped out Natalie Vegas fix some weird problem with this.
(1) Go over to the Upper Right of the page, just above the Orange bar. Just above the Advanced Search Box, you'll see "Settings."
(2) Click on "Settings."
(3) On the Sidebar on the Left Side of the page, you'll see the "My Settings" category. Inside that category you'll see a "My Account" sub category. In that sub category, you'll see a "General Settings" link.
(4) Click on that "General Settings" link.
(5) Scroll down to the bottom of the page where you'll see the "Miscellaneous Options" category.
(6) The 1st option you'll see is selecting between "Basic Editor" or "Standard Editor."
YOU probably have your setting set to "Basic Editor."
(7) So ... Select "Standard Editor."
(8) Click on the "Save Changes" Button at the bottom of the page.