IP address displayed to users does not update when ip address changes

I installed the domain mapping plugin before setting up a dedicated IP address. Now that I have a dedicated IP address the plugin is still showing the old IP address to users.

I tried to deactive and delete the plugin, download and reinstall in the hope that the IP address would update. however, the old IP address is still displayed.

Looks like the only way to solve the problem is manually delete the tables created from the database and reinstall the plugin.