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I checked your jotform http://www.jotformpro.com/form/43065239367964 and I found that there were many deleted fields that were on the conditional statement of the form.
I think you have deleted fields on your form. So they were not properly cleared on the conditional statements.
You can clean the form by removing/deleting all the conditional statements that only have deleted fields on them.
BUT if you wanted to do instead is to restore deleted fields from the form (reverting to previous version of form), you can do it by using the Form Revision History feature.
user guide: -How-to-View-Form-Revision-History
Hope this help. Let us know if you need further assistance.