Why AP expiration date does not match H1B expiration date waitfor4852008-02-14 15:01:51

My status H1B and I485 pending.
I used AP to enter the US a couple of months ago.
Just found out that the USCBP officer gave me an AP expiration date which was about half year earlier than my H1B's expiration date.

Is this a mistake? Is it common?

Thank you very much

not mistake, just ignore it.

As Sqgs pointed out, it's a procedure.

Why my AP expired half year after the entry date, not 1 yr?

usually is one year after entry date.