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High age in pump common header because of low flow

Dear All, 

I performed age analysis calculation for my water distribution model. I attached the screen shot of the model for reference.  Here P-596, P-597, P-598 are the pipelines showing very high age because of very low flow in the pipe. I was not able to understand, that even pump delivers the flow of 26528.21 m3/d in the discharge side, why the flow in common header is negative?.  From the attachment we can see that after the final node again the full flow is there. 

i need suggestions to rectify the model. 

Thanks,

RSP