in previous versions the Node List - Custom Groupingand Filtering worked as follows.
if all 3 selected criteria was BLANK in the custom property fields the node was placed into a default tab called "UNKNOWN" and there was no pull-downs
if one of the criteria was BLANK in the custom property fields then that TAB wasn't visible on the website.
Example we sorted by CustomerName, Region, Building. So if we only had CustomerName and Region fields filled out the pull-downs would only go 2 deep.
now for the BUG in 8.5
if all 3 selected criteria is BLANK, then that node will be in a pull down button that has no title and then you also have to drill down 3 levels of blanks to get to the nodes listed under it.
If one of the criteria is BLANK, then that tab within the pull-down is untitled but appears on the website..
if you can understand this issue great, if you need me to send a screenshot to show you, please let me know.
Thanks