Flange shear cut error

Hello!

I am having trouble understanding why the shear design of a flange shear cut fails (shear cut 5,6). Specifically, the calculated shear force between flange and web (T) and the principal compression stress of the concrete is extremely high and I am currently trying to verify it by hand calculations. Is it possible to display the calculated lever arm, or the change of the longitudinal force in the selected beam so I can verify the calculated shear force?

Thanks in advance,
Alex