[Theme: deTube] Posting the video twice at same page

hi all,

i have theme named deTube. Im just clonning my clients page and changing them theme. Everything is ok. i clonned it succesfully, its working but, as you can see in this page

https://hasantasdelen.com/gctv/rmit-university-australia-gctv-fairs/

its duplicating my video post at same page. i didnt see an error like this. what must i do?

in themeforest page author dont answering or solving any problems.

PS: its a demo page so just 4-5 video post are working.
PS: my first wp is 3.7.1 but it was same. so i want to try my chance an old wp.

thanks for helping