POPUP PRO PAGE SCROLLING ISSUE

Hi, I have an issue with the POPUP PRO plugin and the Sahifa theme. The problem is, I have removed the check mark from the "Allow page to be scrolled while PopUp is visible" option, but the page still can be scrolled within the Sahifa theme.

The scrolling is working if we put the mouse cursor on the gray background or on the title of the popup box, but the scrolling will stop if the mouse cursor is right on the content of the popup box. That means there are some scrolling issues with the POPUP PRO plugin and the Sahifa theme.

Hope you can help me. Thx!