Changing Chart's Source Data Won't Work

Hi,
I've been working on an excell script that get every week different CSV files, imports them to excel, and creating charts for each sheet.

Creating a first time Chart is working like a charm:

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However, whenever I try to update the SetSourceData for an existing chart, I get wrong range and wrong chart's data. The updating macro is:

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Which is exactly the same as creating the chart.

I would appreciate any help.

Thx ^_^

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