Guest user can’t see thread

I have installed this plugin because my old comment thread was not working fine. When i login i can see this plugin thread fine but when i logout i can see the old comment thread. I have enable guest user from the form setting but still i can’t see as a guest. what should i do further?

https://www.yogaencreatievevakantie.nl/informatie/meet-and-greet/

The page I need help with: [log in to see the link]