Conditional Field isn’t working

Hi,

I’m trying to set a conditional field, I’ve followed all the steps from this link:
https://www.visser.com.au/documentation/woocommerce-checkout-manager/usage/#Adding_Conditional_Checkout_Fields

The conditional field isn’t working at all…

Here is the link: https://giantel.vbrweb.nl/afrekenen/
After chosing ‘Ja’ at the second last question (additional fields section), a new question should be show up.

Can you please help me fix this issue?

Thank you!

Kind regards,
Jasper Oomen
Van Boxtel Reclame