Our team made a decision to make the tabs vertical. BePro Listings currently has 14 addons, making a horizontal tab setup unrealistic for many of our customers.
The issue is contained to the MTClassifieds theme in particular. We have released a new version of the theme which you can download from your My Accounts page.
The only change to the new version of the theme is the style.css file. So you can copy that over if you prefer not to update the entire theme. Please accept our apologies for any inconvenience during this transition.
BePro Software Team