Incorrect representation of Progress Line in summary bar??

Dear All,

I have baselined my schedule and started recording the progress.

when i put the progress line,it shows prefectly correct for all the activities.But in the summary bar the Progress line goes ahead of the status date.I have 10 activites under that summary bar and in that 2 activities are over as per the plan.So by logic the progress line should show straight instead of moving ahead.Why is this thing happening...

Please guide me

thanks in advance