Not showing depending of which user

Hi,

This is my first post in this forum so I hope I am posting in the right category with a clear enough title.

I am struggling with comments on a WordPress website : it was not developed by me initially and I am pretty new to WordPress. So there is my issue :

I have different pages where comment are shown. Each registered user can add a post as it’s a classified ad page. Then once a user have add an ad, every users can consult the page and see comments.
Only registered users can post comments.

I am correctly calling <?php comments_template(); ?> in my single.php as comments are correctly showing for Admin users and the user who posted the classified ad.

But my issue is that I don’t know why other peoples are not capable of getting the comments showed. I tried to request manually the comments via an get_comments(array(“post_id” => get_the_ID()));
get_the_ID() returns me the correct ID so the problem does not seems to be here.

However something strange is happening : get_comments_number() return me the correct amount of comments.
I am currently using this method to get the comments :

wp_list_comments( array(
					'style'       => 'ol',
					'short_ping'  => true,
					'avatar_size' => 74,
					'callback'	  => 'nyfc_comments'
					));
					?>

This method works for post author and admins.

I don’t have any special plugin included that could alter the comments nor the users roles.

Do you have any clue ? Is there a WordPress restriction about non-admin posts ? About comments ?

I hope that I had been clear enough, if not don’t hesitate to ask me further questions.

Thank you, I am struggling on this since two days and I do not see any solutions…

[ Multiple bumps deleted. No bumping please. ]