I'd recommend a total cleanup and a new install by following the below procedure to solve this because unfortunately remotely it is quite difficult to troubleshoot such issues.
1. Uninstall plugin
2. Ensure these two tables are deleted:
(note: the prefix of the tables depends on the prefix you use)
3. Run the below query to return all of the plugin options stored in the wp_options table in the WordPress database (again, the prefix of the table depends on your database prefix):
SELECT * FROM
option_name like 'WPPH%';
Once the values are returned, delete all of them.
4. Download and re-install the plugin.
If the issue persists, if possible we would like to have a look ourselves. This will help us identify the problem and fix your issue as soon as possible.
So if the problem persists, drop us an email on firstname.lastname@example.org.