Are you pushing bills across from HubDoc and you are seeing the reference "Unclassified Biller" in QBO? 
Here is where it is coming from:

In the top section of the HubDoc screen, you have the option to choose a vendor/supplier.  This is actually the folder that is created in your HubDoc filing system.  But, if you don't have anything selected when you publish it across to QBO, you will see the reference of Unclassified Biller.

So make sure that you choose a vendor in both sections of HubDoc before publishing.

Learn more about HubDoc.

Updated: May2017