Unable to select products on the list

Lastly, when I tried out the form and checked off the circles, it does not show up as checked off. How to fix

To verify, are you referring to when you are trying to select an item on the product list? I cloned your form and it seems working fine on my end:

Can you provide us with a screenshot, where you are showing the issue on your end to further assist you? If you are referring to a different form can you also provide us with the form's link?

Thank you. Looking forward to your response.