Burndown chart does not show correctly

I am using Power BI Online to connect to Visual Studio Online project using Scrum template, it generates a Scrum Sprint Status (Burndown chart), I tried to filter its data by using Iteration Path field in order to show November sprint only, but the problem is data of October and December is also shown up! so the shape is not the same as what I see in Visual Studio Online.

How can I fix this, please give me an advice. Thank you very much.