Multiple answers selection not working

I am trying to create a personality quiz, using the latest version of the plugin. We have a similar one built on another website, using an older version of the plugin: https://www.websitetooltester.com/en/website-builder-smart-finder/

We are trying to recreate the same last question as in the older quiz, where users can select multiple answers. I have the ‘Multiple answers selection’ checkbox ticked for that question, but when I test it, it doesn’t let me select multiple answers. Instead, it just takes me straight to the result as soon as I select one answer. It doesn’t show the ‘Continue’ button like it does in the existing quiz, either.

I have copied all the settings across from the older quiz to the new one, so can’t figure out why it’s not working. Can you please help?