Form Calculation Issue

Hello, we recently had a member register four players for our golf tournament using a dynamic text box that calculates it to be $200 per completed field so the total should be $800. I am using a hidden field to pass the calculation so they can't edit it and can see the subtotal. The submission email I got shows the total to be -$1200, the submission itself in JotForm shows it to be 1000 when it should be 800. I can't figure out what in the world is going on? We've received over 20 registrations for this event using this form and not once has any registration come across like this. Screenshot of the erroneous submission is attached and the form URL is below. 

I cloned the form to test it further and I was not able to replicate the issue. I checked your form calculations and it is configured properly. 

Is the issue resolved? Here's a screenshot of my test:

I have cleared your form cache on our server. Please test it again and let us know how it goes. 

Thank you.