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Can you please try first disabling the Auto Save option of the Form Builder.
This way you will have to manually save the form changes.
I have checked the Revision History of your form http://www.jotformeu.com/form/53394232157354 and I have noted that it had been saved multiple times already. Meaning, saving the form had been working.
Hope this help. Please let us know if issue is not resolve.
Yes, your advice helped me! Thak you very much for such fast and correct answer with simple manual. You are the best !))
You are quite welcome. :)
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