At the beginning of 2021, a new magnetic field map was produced in order to better reproduce the actual field. When we reconstruct data using the new map, we observe much better agreement between the observed peak position of several resonances and the PDG value. The shift is up to 10 MeV or so when looking at the dimuon invariant mass. The online globaltag was still containing the old and deprecated map: this induces a lot of confusion when comparing DQM plots or data produced with online and data reprocessed offline with the new map.