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Sequential load distribution scheme seems not working

I am modelling with multiple water cooled chiller in energyplus.
In idf file, I specified SequentialLoad for Chilled Water Distribution Scheme. However, looking at the result, it seems that multiple chiller is operating before 1 chiller get to full load as shown below graph.(x:part load ratio/y:COP)
image description
Does anyone know why this happen?

Sequential load distribution scheme seems not working

I am modelling with multiple water cooled chiller in energyplus.
In idf file, I specified SequentialLoad for Chilled Water Distribution Scheme. However, looking at the result, it seems that multiple chiller is operating before 1 chiller get to full load as shown below graph.(x:part load ratio/y:COP)
image description
Does anyone know why this happen?

Sequential load distribution scheme seems not working

I am modelling with multiple water cooled chiller in energyplus.
In idf file, I specified SequentialLoad for Chilled Water Distribution Scheme. However, looking at the result, it seems that multiple chiller is operating before 1 chiller get to full load as shown below graph.(x:part load ratio/y:COP)
image description
Does anyone know why this happen?

Added
Timeseries stack plot and stack plot by ascending total cooling rate is added following @aparker instruction.
image description

image description

Sequential load distribution scheme seems not working

I am modelling with multiple water cooled chiller in energyplus.
In idf file, I specified SequentialLoad for Chilled Water Distribution Scheme. However, looking at the result, it seems that multiple chiller is operating before 1 chiller get to full load as shown below graph.(x:part load ratio/y:COP)
image description
Does anyone know why this happen?

Added
Timeseries stack plot and stack plot by ascending total cooling rate is added following @aparker instruction.
Looking at the 2nd graph, I can see the fluctuation when the consequent chiller start to be operated. Is this usual? or something is causing this fluctuation?

image description

image description