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I'm sorry for the trouble caused to you.
I am unable to replicate the issue you are having. I was able to open and save your form successfully. It could be temporary browser related glitch. Please clear your browser cache and that should solve your issue. The following guide should help you clear browser cache: http://www.wikihow.com/Clear-Your-Browser's-Cache
Do get back to us if the issue persists.
Thank you so much.