I don't know if it is a known bug or not, but I had this on my shipping Z. There is a cache somewhere, probably printer hard drive related that is not updated or fetched when called. I told HP what happened, and they thought this was strange. Maybe I am the known bug in more ways than one.
It did clear, the next day, after I ran the utility on my Mac. When I went back to the PC it had disappeared.
There is also a cache problem when updating drivers or rather utility, on Mac , sometimes the utility will loose it's functions such as all calibrations, profiling etc, in the interface. It will appear later on for unknown reasons. I may have a lot of conflictual software though as I have 4 HP printers which are supposed to have links to the utilities.