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could you please asking to that site template provider about how to turn off magnific popup from that template/theme?
that magnific popup script conflict with jomsocial.
becuase your site is a live site. can I switch to protostar and disable all modules?
and I suspicious with JSPT system plugin, JSPT Community Plugin, Phoca Gallery Plugin, and Tabs -- For Articles [uyguntabs] plugin
could you please try to turn off that plugin by using protostar?
the issue with jQuery Easy plugin and theme1827 template.
seem that template must using jQuery Easy.
if you turn off jQuery Easy and theme1827 template, the issue will be gone. jQuery easy still using very old jQuery version (1.7.2)
jomsocial must using 1.11.2.