Can you start your story again for better evaluation. Initially you talked about batch A and B, your screenshots show different batches, which one was A and which one was B ?
As the GR date in the quant is the same date SAP has no option to consider the original GR date. So it will use other characteristics.
What I see is that the batch with the higher batch number (I guess this is your B) is in the bin with the lower bin number.
Can you check whether the picking sequence was eventually the bin number, and if this eventually makes sense then for the quantities that got picked?