What is a reliable form calculation widget that won't erase everything I input into it?

I am using the Form Calculation widget, the only one mentioned if you type in form calculation when browsing widgets. This form holds the inventory for a liquor store and I need to calculate the products and prices. After hours of input to the widget I hit the finish button and click save on the form. After it finishes saving I close the window. When I open the browser and go back to the form everything is erased. I need a working form calculation or I can't use jotform. Thank you for your time.

The form calculation widget will work, however, there are limits for the number of fields that can be added to a single calculation.  I would recommend using a calculation widget for each section, then using a final calculation widget at the end of the form to total up the calculation widgets from each section. 

You may also want to consider breaking your form down to multiple forms.  The volume of fields in the form may be a bit much for browsers to handle.  Generally 200 or so fields in a single form, especially if there are calculations, conditions, multiple pages, collapsed sections and things of that nature, should be the upper limit of a single form.