Report Component - adding a pie chart appears twice

Hello,

I need to create a pie chart in a report component (under dashboard). So i created a very simple cube view with 2 elements of the UD1 dimension, and 1 column showing up an account. With this cube view, I created a data adaptor, with Command Type = Cube View and Data Table Per Cube View Row = False; when I open the data adaptor then I can see the correct data, with 2 rows and 2 amounts then.

Now, when I create a report component and add a pie chart on it, the pie chart appears properly and as expected (2 pieces in the pie, for each UD1) but it appears twice ! And twice the exact same pie! Any idea from where/which setting this is coming from please? I am struggling in finding it.. 

Thanks in advance,

Florence