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I'm sorry for the trouble caused to you.
With which form you are having this issue with? I did check your last edited form "Helen Beshan - Homefront Pioneer" and did not find any issue with that. I was able to make changes in form and save it successfully. Please check the screenshot below:
The issue you are having could be a browser related issue. I would suggest you to clear your browser cache and try again to edit your form. The following guide should help you : http://www.wikihow.com/Clear-Your-Browser's-Cache
Do get back to us if the issue persists.