My instance posts are accessible from other instances but comments from other instances aren't accessible from my instance

Here's the link to the original instance : https://blog.kaki87.net/c/kaki_blog?dataType=Post&sort=New

Here's an example comment from another instance : https://0d.gs/comment/5903730

Here's the same comment on yet another instance : https://jlai.lu/post/21115531/15881483

But from the original instance, the comment doesn't show up.

What to do ?

Thanks