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You said that you are working with the form for 2 days right? When you took a break or stop working on the form, do you just leave it or do you save it using the save button? Do you also log out from your JotForm account when you stop working.
The possible reasons why would this happen are the following:
1. Form builder is open on multiple tabs/ windows or multiple browsers. The form builder has an auto-save function. So avoid opening the form builder on multiple tabs/ windows.
2. You got disconnected from the network or have an intermittent network problem.
3. The user is not logged in to their JotForm account or probably got logged out.
Let us know if you're still having issues with saving the form.