Hello, @Amir
You used out of date version of theme and core plugin that was not compatible with WP 5.8. Besides one of the third-party plugins caused the issue with the widgets but we can’t check which one because your hosting blocks our IP and we can’t access your site to test and to your FTP https://prnt.sc/1g9ldtb
Please, disable the firewall to allow us to find the reason of the issue.
Regards