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I've cloned your JotForm to my account to see if I can edit the JotForm and I was able to edit it without any issues. This could be an issue with session time out or browser caching issue.
Please try clearing the browser cache by following the steps provided in the guide below :
Please make sure that you are logged into your account while editing the form. Also, I notice that your account is still having a guest username. I'm not sure if this is causing the issue, but if you want we can change it with your required username, if available.
Let us know if the issue still persists after clearing the cache. We will be happy to look into this issue further.