values when using dropdowns in forms

I have a form that does a calculation on a dropdown field that has the options

Item: Product A         export value: 599

Item: Product B         export value: 799

Item: Product C         export value: 999

The form on my local PC calcs properly by inserting the appropriate value....599 for Product A but when I upload the form to Formscentral it seems that is is unable to do the calc properly?

Any ideas?

Thanks,

Derek