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Set up an EMS output variable for the schedule(s) in question. Then report both the original schedule value and the EMS adjsuted value to hep diagnose what is happening.

EnergyManagementSystem:OutputVariable,
  MyJanSchValue,           !- Name
  externallightschjanuary,             !- EMS Variable Name
  Averaged,                !- Type of Data in Variable
  ZoneTimeStep,            !- Update Frequency
  ,                        !- EMS Program or Subroutine Name
  ;                        !- Units

Output:Variable,*,MyJanSchValue,Hourly;
Output:Variable,externallight-sch-january,Schedule Value,Hourly;

I hope I have presented this correctly. See EMSCurveOverride_PackagedTerminalHeatPump.idf example file for more information on reporting of EMS variables.