Displayed tree no nice

Hi,
As you can see on my website http://www.gryphon-eco.com
at right side, the WP-dtree, is display with blank space and space between line.
Not showed like the example in the menu.
There is a gaps between 2 lines and not aligned with the cross.
Could you help me ?
Thanks

https://ww.wp.xz.cn/plugins/wp-dtree-30/