An error in the electron-newSC matching has been identified for the same kind of events. In this case the matching is done between the electron eta,phi and the SC eta,phi. For the above mentioned case, the eta,phi of the electron and positron is the same and this generate an ambiguity. One possible solution should be:
* extrapolate the track eta,phi to the ECAL and than match with the SC eta, phi
Error in ElectronRecalibSC module