Below is the differences between qp 11 and qp 12:
Dequantized for qp 11:
Dequantized for qp 12:
Transform for qp 11:
Transform for qp 12:
Residual for qp 11:
Residual for qp 12:
Decoded for qp 11:
Decoded for qp 12:
Hope these can help to solve the problem.