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I ran some tests with a copy of your form and got the same error:
I removed the tax settings by setting the factor to 0% from 7% and that seemed to fix the issue:
Since that is not necessarily a solution, I'll have to send this to our developers in a ticket to that they can advice further.
We shall update you through this thread.
Thank you for your patience.
Sorry for the inconvenience. The problem is now fixed.
Please do inform us if you have other issues at hand.
Regards from the JotForm team!