I-485 LUD changed, but no change in online message

I sent my I-485 RFE to NSC on May 4th, and in two days my LUD changed to May 6th, and the online message was:

"On May 5, 2006, we received your response to our request for evidence or information......"

Then just 1 hour ago, I Logged in to my account and found my LUD became May 10th, 2006, but the message remains the same.

What does this mean? I am anxiously waiting for the I-485 approval. My PD became current in March.

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