Expert in Wordpress (post and plugins are automatically deleted)

I have a Wordpress running at Siteground All Posts delete automatically, (they don’t appear on the website nor we can see it on the wordpress control panel). I check at PhpMyadmin and I see that most of the posts are there, but not all of them, so really only some are deleted. In order to find a solution, I did this 3 days ago. 1. Restored website and database from backup 2. reinstalling wordpress 6.1.1 3. I deleted all users except admin and changed its password 4. deleted all plugins 5. I replaced the .htaccess for a clean new one 6. installed Wordfence security plugin 7. Deleted the previous theme (Generic Press) and replaced it for Hello Elementor Theme 8. I activated from Siteground control panel the Site scanner premium service (I scanned and showed no problems), also activated maximum security disabling php uploads, ftp uploads, I placed all the restrictions Today monday again all posts are deleted from Wordpress control panel, but on phpmyadmin I see most of the posts 9. Again I restored a backup in order to recover the posts and plugins 9.1 Note: Before restoration of backup number of rows in posts database rfv_posts: 828, rfv_postmeta: 10927 After restoration of backup number of rows in posts database rfv_posts: 1017, rfv_postmeta: 12362 So this confirms that posts were actually deleted from database 10. I eliminated all plugins and installed site ground security plugin 11. I manually installed wordpress 6.1.1 12. I placed a new .htacces 13. I placed siteground security plugin and placed also 2 factor authenticator and placed maximum restrictions for more security 14. Changed admin password (there are no other users) 15. At site scanner service from Site ground I scanned again and placed maximum security 16. I changed the database password then the same problem happened again posts deleted and plugins deleted