JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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This problem usually happen when there are mutliple instance of the Form Builder opened on the same browser.
Please try this procedure and check if it resolve the issue:
#1 Log out of JotForm.
#2 Close all open browsers
#3 Open browser and login to JotForm at https://www.jotform.com/login
#4 In your Form Builder open your cloned form you want to Edit.
#5 Edit and Saved the form.
#6 Preview the form and check if changes are now properly saved.
Let us know if issue still persist.