I have my nodes set up as follows:

As can be seen, "Archive" is a child category of the "Fantasty F1" forum and itself has 3 sub-forums: 2011, 2010 and 2009 Archive.
However, when clicking on the "Fun & Games" forum, both the "Fantasy F1" forum and "Archive" category are shown as if they are siblings of each other as follows:

The "Archive" category is a grand-child of "Fun & Games" and a child of "Fantasy F1" and therefore shouldn't show up in this view.
If this is not a bug then ideally there would be an option to choose whether to display nodes 2 levels up.

As can be seen, "Archive" is a child category of the "Fantasty F1" forum and itself has 3 sub-forums: 2011, 2010 and 2009 Archive.
However, when clicking on the "Fun & Games" forum, both the "Fantasy F1" forum and "Archive" category are shown as if they are siblings of each other as follows:

The "Archive" category is a grand-child of "Fun & Games" and a child of "Fantasy F1" and therefore shouldn't show up in this view.
If this is not a bug then ideally there would be an option to choose whether to display nodes 2 levels up.