So I contacted them and the theme’s support refer this problem to Buddypress. They claim that the problem is not caused by their theme. even the fact that when I disable their core plugin, I no longer have this issue.
I’m using Dimita theme which I bought from WPbingo and when I disabled its core plugin, the problem was solved. bwp_ajax_filter, I have no idea how to find that and I don’t even know what to do when I fount it. xD
I guess I bought a cheap theme, apparently, they have a loading cover and my undersanding of its functionality are limited.
How can I find bwp_ajax_filter ? and what should I do with it. Maybe that could solve my problem without chaning my theme 🙁