How do you print the report - through code or from the respective viewer? If the latter, please specify which viewer you're using since all viewers use different technique for printing. Also can you test what happens if you export the report to PDF and print it from the PDF document - is the margin correct? The fastest way to get to the bottom of such problems is if you provide us with a sample runnable report that exhibits the issue. This way we can review it and get back to you with our findings.
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