language dropdown closes immediately

I have set two languages for a form, Dutch (default) and English. However when I try to set the language in the form, the dropdown closes immediately. I have test the form in both mac as windows browser and also tried to to embed the form trough an iframe, however the problem persists.

I have set to autodetect the language of the browser, this does work. But the dropdown still does not work properly.

I've checked the language options on a separate new form to check if the feature is working properly and see that it works great. It looks like that there is an issue with the form since I'm able to replicate the issue with the cloned version as well. Let me investigate the issue further and get back to you later with relevant information.

Thank you for your patience.

Thank you for your patience. After investigating the issue, I found that the radio button field "Geef Home Expo 16 een cijfer" is causing the issue. Digging it further, I notice that there is a condition duplicated for this field which is actually causing the issue. The language dropdown is displaying properly when an option from the radio button is checked. Please see the screencast below:

Please remove the duplicated condition for the field so that the language dropdown should be displaying properly.

Thank you!