[Opserty]

A quick fix for the strikethrough:

1. AdminCP > Plugins & Products > Plugin Manager > Find the Plugin Titled: "Opserty: (6) Apply Markup"
2. Click the Title or click on [Edit]
3. In the "PHP Code:" text box. Find:
   
   PHP Code:

   $user['musername'] = str_replace('{OP_USERNAME}', $username, $user['op_markup']); 

4. Replace it with:
   
   PHP Code:

   $user['musername'] = str_replace(array('{OP_USERNAME}', 'strikethrough'), array($username, 'line-through'), $user['op_markup']); 

5. Hit Save.