Custom formula doesn't always work

Hello. My application has an input field for the number of items and a text field that shows the amount due. This amount is calculated using a custom formula: number from input field 1 * price per unit of item #1 + input from field 2 * price per unit of item #2, etc.
The problem is that sometimes the calculation is done and sometimes not. Perhaps for this to work you need to refresh the page several times, perhaps this is not the reason.
Can anyone help?

It looks like the problem was that the default value of the input fields was not set.

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