1. Log into your cpanel account.
2. In the "Software" section, . "MultiPHP Manager" Icon.
3. Scroll down to the end of the page, select your domain from the left side and you will see the option "PHP Version" with a drop-down on the right side. Select the "inherit" option from the drop-down and click the Apply babies.
If will take a few seconds, after which your PHP version will reset to the default version.