Hi @sinahosseini
Did that happen after some plugin update? Maybe you could ask your hosting if they have some database backup to revert back any unneeded changes.
Users’ capabilities are stored in your database in the wp_user_roles option in the wp_options table so maybe you can edit data there. You can use cPanel or one of the database plugins but please do backup first for security. Here you can find default value for this option, but please note, that they remove any customizations and custom roles capabilities so you need to be very carefull:
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Best
