Select options on form are not working with Popup Maker plugin

I have a problem with Forminator. When I insert a “select” field on my contact form, only the first option is visible.

I am using the Popup Maker plugin to create a popup and I added the forminator’s form shortcode on it.

Everything seems to be working fine EXCEPT the SELECT field dropdown menu, it just displays the first option available.

I tried pasting the same form’s shortcode on a test page and it works fine on it, but when I use it inside the popup the dropdown menu of the select field stops working.

Would it be possible to get this working with Popup Maker plugin?