I had the same problem : when navigating away from a page to go to a post (by clicking in another widget), the page remains selected in the wp-dtree widget.
Here is my dirty fix :
– In file wp-dtree.min.js, I replaced the string “useCookies:true” by “useCookies:false”.
– I did the same in file wp-dtree.js line 86, although it has probably no effect.
Keep up the good work !