Please post in the existing forum thread you opened on the same question - Chart position changes during sending email with attachment
. Thank you for your understanding.
As my colleague explained in this thread, the described behavior might be caused by overlapping items in your report. Test if rearranging the items to avoid overlapping will make a change.
As we are not certain what causes this behavior on your side we would need a runnable sample project in order to provide you any further suggestions. Please open a support ticket and attach the problematic report demonstrating your current settings and test data.
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and vote to affect the priority of the items