Structures in matlab, fdatool

Hello.

I am using fdatool on matlab to see how the number of bits used for quantifying affects the different structures, direct form I and II.

When exporting my coefficents to matlab, with variables names SOS1 and G1 for form I and SOS2 and G2 for form II, these variables are differente, which is what expected.

Nevertheless, when I use the function sos2tf on SOS1 and G1, for example, I get the same return values as using the same values for SOS2 and G2. Therefore when quantifying my coefficients I get the same results for direct form I and II, which can't be.

Is there anything wrong?

Thank you