Due to an issue with Steam Family Sharing, some players may have noticed Shillings or premium items being added to their account without having purchased them.
This issue has now been resolved. However, if you have used the Shillings awarded from DLCs that you did not own (but somebody on your Steam Family Share did), you may notice that your Shilling count will reduce, potentially to a negative value*. You have not lost Shillings; you have simply spent more than you should have had.
You may also notice missing purchases (such as Bögenhafen weapon illusions) in your inventory, and on your items. These items have not been removed from your account or un-applied from your weapons, however, to use them again you will need to own the relevant DLC yourself.
Completing weekly and daily quests, as well as purchasing the Vermintide 2 DLCs, will still reward you with Shillings.
*Update: All players with a negative amount of Shillings have since been reimbursed, and those affected will now have a Shilling count of zero.