Comment section missing

Hello everyone

i’am having a problem with the comment section in my website,it just vanished

i made sure to allow comment on all my post, but i don’t find the comment section

in my older post where the comment section was active you can see the comment people posted but you can’t reply anymore,

and now all new post don’t have the comment section

how can i fix this problem ?

thank’s in advance for you help

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