Need help with calculation field

I have two form calculation fields on my form (Credit Card/Paypal payment form). The first (processing fee) calculates a percent of another field. The calculation works, but the user is able to edit or delete the amount which I don't want to happen. The second calculation field sums three fields. This calculation also works and the user is NOT able to edit the field - which is what I want. What am I doing wrong? 

I have cloned your form then added a "short text entry" field. Then I added a condition to pass the calculation value to that text field. I set the text field entry to hidden and hide the calculation field.

https://form.jotformpro.com/72403745705960 - You may clone this if you want.

 

 

Thank you for your response. I have a couple more questions:

Thank you for your response. I have a couple more questions:
1.How do I clone your form and have it appear in my account?
2. I originally had a field that used conditions to calculate the value, (which I renamed “old processing fee” so I wouldn’t lose data) but it could be modified. So I added the new one. I now see that I can make the original field "read only" which accomplishes what I want and seems simpler than your solution. Is there any reason not to do that?
3. I still don’t understand why my “Total” calculation field isn’t modifiable if the “online processing fee” which was also used the field calculation widget was???
Thanks for you help.
...

1.To clone a form kindly follow this guide https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL

 

2. Yes you can you use that. I just didn't use that since you have already added a new calculation field ( lazy to rename) lol.

3. It is because "Total" field is a "calculation widget" which in other words not an input field. 

While the "processing fee" field is a "Short Text Entry" widget which can accept input.