The maximum printable area is defined in the PPD supplied by the printer manufacturer. If you are not using the correct HP PPD file or the PPD does not accurately represents the printer engines maximum print area, then the print job could request the PostScript interpreter to create a raster image that extends beyond the engines physical margins and ability to print it. This could result in the symptoms you are describing, in that the image area is getting clipped.
You should contact Hewlett-Packard Tech Support to obtain the
appropriate PPD file.
The Tech Info Library article titled "Locating Vendor Information" can help you search for a particular vendor's address and phone number.