It would be good to see the error_log file of the wp-admin and post screenshots
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This reply was modified 4 years, 8 months ago by jorgeug.
The hosting service may have restored an old version of the website. This happens when they have technical problems then they look for the latest backup but sometimes it is a very old version.
It is recommended to constantly download a backup to avoid this.
In the meantime contact your hosting provider probably have a more recent backup.