This is what happens when a programmer tries to fix conceptual shortcomings of a different programmer, but neither really have a clue.

The plugin attempts to overcome the unbreakability of post titles by inserting HTML styling markup right into them. This creates more problems than it solves, i. e. all such titles become unreadable in all the backend views.

Be forewarned, that uninstalling the plugin will not remove such markup. You will and up removing it menially.