Choose bank dropdown not working

Hi there,

On the iDeal payment method, the dropdown to choose a bank is not working.
When enabled, only the text “Selecteer jouw bank” is showing, but no dropdown.
When disabled, the same happens and the text is still showing.

I have disabled caching/minifying plugins and tried using incognito mode, but it didn’t help.
I’m also getting a lot of cancelled orders without payment, so I’m wondering if the payment options are not working correct. I have tried it myself, and it is working.