Try download my attached file and replace into JoomlaFolder/administrator/components/com_easydiscuss/includes/string/string.php then try edit your discussion post and resave again, and see how it goes?
You are most welcome. Glad to hear that your issue has been resolved now. This fixes will be included on our next released version. Thanks for your understanding
As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.