[PWGCF] fixing bug for efficiency correction (#15064)

Co-authored-by: ALICE Action Bot <alibuild@cern.ch>

Author: jikim1290

PWGCF/JCorran/Tasks/jEPFlowAnalysis.cxx

@@ -169,6 +169,7 @@ struct jEPFlowAnalysis {
     effVars[1] = eff->GetAxis(1)->FindBin(pt);
     effVars[2] = eff->GetAxis(2)->FindBin(multiplicity);
     effVars[3] = eff->GetAxis(3)->FindBin(posZ);
+
     return eff->GetBinContent(effVars);
   }
 
@@ -251,7 +252,11 @@ struct jEPFlowAnalysis {
 
     if (cfgEffCor) {
       auto bc = coll.bc_as<aod::BCsWithTimestamps>();
-      effMap = ccdb->getForTimeStamp<THnT<float>>(cfgEffCorDir, bc.timestamp());
+      currentRunNumber = bc.runNumber();
+      if (currentRunNumber != lastRunNumber) {
+        effMap = ccdb->getForTimeStamp<THnT<float>>(cfgEffCorDir, bc.timestamp());
+        lastRunNumber = currentRunNumber;
+      }
     }
 
     float cent = coll.cent();
@@ -350,7 +355,7 @@ struct jEPFlowAnalysis {
           continue;
 
         if (cfgEffCor) {
-          weight /= getEfficiencyCorrection(effMap, track.eta(), track.pt(), cent, coll.posZ());
+          weight = getEfficiencyCorrection(effMap, track.eta(), track.pt(), cent, coll.posZ());
         }
 
         float vn = std::cos((i + 2) * (track.phi() - eps[0]));