GPSI Software remains cached on AD

Hi. I've got one GPO where a software installation remains cached. It does *not* appear in the actual GPO (when opening GPM and modifying the GPO) but when a computer retrieves the GPO it still sees the software (i.e rsop.msc) after gpupdate /force and restart.

This is not a PC problem as it happens on any PC that the GPO was applied to. So it's something with the DC/AD itself. How can I go about purging this particular package from the GPO so that clients don't pick it up any more?

I am also unable to copy the GPO to recreate it. I get the following error during the paste process:

GPO: IT Computers...Failed
The system cannot find the file specified.

Copy of GPO failed. Error [The system cannot find the file specified.
]
 Details:
     Source GPO:
         DisplayName: IT Computers
         ID: {BE52B3B6-FEC8-48A5-AA18-CB59D0AC8CE5}
         Domain: xxx
     Destination GPO:
         DisplayName: IT Computers
         ID: {97B8D411-986F-45FE-94B0-B3BA96A35225}
         Domain: xxx