If the OC still owns the debt, which would be indicated by the fact that they are still reporting a balance, then yes, both can report.

It is not really "double reporting" of the debt.

The OC is reporting the debt owed to them.

The debt collector is reporting the amount they are authorized to attempt to collect.

Should the debt collector purchase the debt, the amount they are reporting would then become both debt owed to them and debt they are attempting to collect.  The OC would then report $0.