Visual Studio - Crystal Report: Abnormal Behavior from Crystal Report with Charts

Hi,

I'm using Crystal Report 13 under visual studio 2012 where i build a report that contain pie chart and bar Chart in two different sections in the report header the report get the data from a DataTable.When i display the report in Crystal Report Viewer it is fine and as expected but when printing the report i get the first chart overriding the second chart: here the right report as displayed in CRV:

And here the wrong print out where the pie chart is duplicate and override the bar chart:

I inserted both charts in two sections in Report header and they get the data from the same DataTable. the pie chart: On change of: Discipline show values SumTotals and the Bar Chart On Change of Disciplie show values SumTotals and SumCompleted. I need your help to prevent Pie chart form overriding the bar chart by duplicating itself

Thanks in advance.