Hello,
Look, you edit the Instagram wall page on video but then press on the front page to check the changes. Why? If you edit Instagram wall page then preview the Instagram wall page https://prnt.sc/13o6d50 .
If you want to change the content of the front page then edit the front page https://prnt.sc/13o6acp
Because Instagram wall and Front page are 2 different pages for your information.
Regards