Incorrect Form Calculations

I am having problems getting the correct calculations to fill in.

Here is the form - https://form.jotform.com/220227071124946

If you enter 500 to print and 500 to mail it = 638.53

If you enter 500 to print and 450 to mail it = 757.33
Why am I getting a larger amount with only 450 to mail as opposed to 500 to mail.

Can you check my set up? When you look it is also effecting the other quantities.

Hi ccnewsletters,

Thanks for reaching out to Jotform Support. I have reviewed the Update/Calculate Field condition associated with How Many To Mail field and currently, the value between 250 and 499 has a bigger multiplier used in the formula compared to the value between 500 and 749 for condition #23 and #24, as shown in the screenshot.

Could you double-check if you are using the correct values for the formula?

Give it a try and let us know how it goes.