Hello, Ahmad Ghader,
Thank you for contacting us and for using XStore.
1/ We’ve edited your “test page”, and duplicated a section without any problem https://prnt.sc/Bd93Qsa3NoFb
Please clear cache of the browser, and record a video of the problem for us.
2/ About – “also when trying to update page without an elementor i got the following message: updating failed, the response is not a valid json response” – please record a video also.
You can upload the video on a filesharing service, for example – https://wetransfer.com/ , and provide us with URL.
Thank you for your cooperation and we look forward to hearing from you soon.
Kind Regards,
8theme team