Problem in comments in Elgg 3

In the Elgg new 3x version, the comment box disappears after the first comment. For example, an user writes a blog post. When the blog post is published, a comment box appears at the bottom. The first commentor can see the comment box but the others or if the first commentor comes again no comment box is visible. Another problem is that, latest comments do not appear at the bottom (the way it appears in elgg org or fb or any site) and the user is not automatically scrolled to the comment he just posted.