There are duplicated (two or more) Product Metrics displayed for each Product on the Account detail page. There is only one product metric record for each Product associated with that Account. All of the duplicated metrics belong to the same Detail Group(s).
For every affected Product record, there are two or more Product Group records present that are linking it to the same Detail Group.
Delete the additional Product Group records. Only one unique Product Detail Group record is necessary.
CRM Help Documentation: Displaying Product Metrics