Plugin incompatibility with theme

Hi

Im having issues with this plugin having negative issues with the theme of my site: http://runnermag.ca

When I only activate this plugin i get issues like: https://imgur.com/a/P3Wf2

Is it related to this issue: https://wordpress.org/support/topic/overlay-issue-2/