Create a Set of Checkboxes for different questions but it wont stay checked when i check other question(codepen)

i created 2 questions. each has 2 checkboxes,. I can check the first one just fine. but when i check the second button on the second question, the first button becomes unchecked… how do i fix this. below is my link to codepen where i am working on it. thank you

https://codepen.io/3nduser/full/aVgqxg/

ok. i fixed it. thank your for your help. but is there anyway to still use YES-NO on multiple radio buttons? or is that out of the question?

Thank you!! It worked!!