No, there's no requirement that the RCMP communicate what it does to the initial police force.
The policy, as I understand it--and perhaps other members of the RCMP can speak to it--is to communicate, immediately upon receipt of a DNA data bank order that, on its face, is defective, with the police force to clarify whether or not there might have been a technical issue that it could clarify, that there was a typo, that there was a problem that the court could correct directly without having to go through this process.
So the communication has been ongoing to try to rectify this immediately with the police force that submitted it, and these 1,725 are all cases where nothing further could be done to deal with it as a technical matter by the local police force.