Hello,
I have the same problem. The clue given by Anexity is correct in my opinion, that there is a problem with the CSS defined for the the .children class.
The container used for nested comments <ol class="children"> comes from the WordPress Core Walker_Comment class, so that is a given. However, it is picking up the styling of .children from section 6.2 of the WhiteDot main stylesheet, main-style.css. This styling is intended for submenus, not for nested comments.
Under many conditions there is a display: none set on this class but there are also several other inapplicable styling settings, meaning that we can’t conveniently override this in custom CSS.
Therefore I believe that main-style.css will need to be amended, further qualifying the context of .children so that it affects only submenus and is not picked up by nested comments.
Regards,
Robert
