Added script doesn't work

Hi,

I added a small script in my source code that checks the paypal checkbox (on the right), when a radio button on the left is clicked. Script works, checkboxes are filled when radio button is clicked, but the total calculation of paypal for some reason doesn't work. It states 0 euros, but when I uncheck and click on the checkbox directly, the total then works. 

What gives?

Thanks!

Form is here: http://kucanskiposlovi.com/narucite-dolazak/

I could replicate the same situation.

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