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LM2841: Why does the top of this part look like this?

Part Number: LM2841

Hello,

We got LM2841YQMKX/NOPB from you, but the tops of chips look like this, is that normal?

QA has found that the tops of these parts appear to have been altered and can't approve to use this part.

Can you please check with your factory and get us an explanation of why this may have taken place?

It's urgent, we think it would get quick reply from this Forums directly.  Pls advise asap, thank you!