Third level removes the second level

First of all its a nice module.

Im just missing one thing.

When I have a 3 level menu, and click on the 3 level child, then all of the 2 level childs are getting removed.

Parent
—Child 1
——Child 2
—Child 1
—child 1

When you click Child 2, then the menu looks like this

Parent
——Child 2

Is there are way to fix it ?

http://ww.wp.xz.cn/plugins/child-page-navigation/