Comments not showing but comments_template is there

Hello ??

I already searched and already had that kind of problem with other theme but it is the first time I can’t find a solution to my problem ?? I did searched everywhere but couldn’t find ( could I be blind today ? )

The problem is common : the comments aren’t showing up when clicking the comments link. No comments, no error message, no comment form. Nothing at all.

The comments_template tag is in the index.php and in the single.php
I tried with the tag in index and without but in single, etc. No change.

Now I’m clueless, why do comments keep playing hide and seek with me ?

You can have a look in here : https://casualtime.dazhibao.org/test/