After the announcement is published - click to edit the ad on the ad page and after editing the ad - save - and eventually delete photos and other ad items.

Tell me how to fix ??

Please send step by step guide how to reproduce on our demo site.

ок

I registered with you on the demo site - but I did not receive the confirmation of registration - so I can not check your demo site for your problem (after the announcement is published - when you edit the ad), user fields and photos disappear. Tell me when will the confirmation of my registration on your demo site come? Demo your site - https://veronika.mb-themes.com/

@Hunter
Activated.

At you on a demo site works - and at me on a site functions do not work. Can you help me with this? I can grant access to the site

Same version of theme you have is on demo, that means problem is not in theme.
Try to test different hosting as such bug is not easy to track and identify.

This error I decided - fixed the syntax error of the PHP in the code of the theme