Popup PRO conflicts with Wordpress Related Posts Plugin

Popup PRO is a great plugin but it tends to interfere with other plugins including WordPress Related Posts.

I was able to solve one problem by adding the following code to the css:

#popup .wp_rp_wrap { clear: both; display: none;}
#popup .wp_rp_wrap * {box-sizing: content-box !important; display: none;}

One problem still remains however. When Popup PRO is activated a duplicate set of "Related Posts" images is served (see attached screenshot). When Popup PRO is deactivated the "Related Posts" images served are completely normal.

Hopefully this can be solved.

Please advise