Posts are not getting edited

Hi,

I am trying to edit my posts but it gets back to its old state and dashboard shows some error which i have mentioned below.

“The backup of this post in your browser is different from the version below. Restore the backup

This will replace the current editor content with the last backup version. You can use undo and redo in the editor to get the old content back or to return to the restored version.”

Please suggest what should i do. My site is hosted on infinityfree.net and cloudflare

Thanks