Problem with total price calculation


The problem
I have problem with « total price » calculation. As you can see on the screens below, the total only update correctly when I type another price in the « donate » input.

Detailed description
I have a script who calculate the intermediate price with the option the user select. This one works great, the price calculate well. But the total price does not recalculate on every change.
The problem does not occurs with my form who has just one price to calculate. In this one, the total update correctly.

The solution I try
I have try the piece of code in this page but the problem still occurs:


Thank you for your help,

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