Price is not showing up on the registration page after Joomla to Wordpress integration
I'd try upgrading Civi to a more more recent version. 

If that does not fix it, I'd look for a plugin/theme conflict. Disable all plugins except Civi and try it. If it works, start enabling plugins until it fails again. If it still does not work, try a basic WP twenty-something theme and see if it works.