Page content is not updating from wordpress page

Hi ,

My existing pages content is not updating from wordpress admin pages section.Even delete and trash action is also not working.I am using latest version.I have tried following solutions:
1) No cache plugin is used.
2) Deactivated all plugins then activate plugins
3) Deactivate theme and then tried to use default theme

Below are the screenshots of Health check:
1)http://www.57pixelmedia.com/standardautocare/wp-content/uploads/2017/12/screencapture-57pixelmedia-standardautocare-wp-admin-index-php-1512891828875-3.png
2)http://www.57pixelmedia.com/standardautocare/wp-content/uploads/2017/12/screencapture-57pixelmedia-standardautocare-wp-admin-index-php-1512891915381.png
3) http://www.57pixelmedia.com/standardautocare/wp-content/uploads/2017/12/screencapture-57pixelmedia-standardautocare-wp-admin-index-php-1512891524615.png
4) http://www.57pixelmedia.com/standardautocare/wp-content/uploads/2017/12/screencapture-57pixelmedia-standardautocare-wp-admin-index-php-1512891359277-1.png

Now Please let me know the solution.

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