You have created your system incorrectly. You should make improvements to the system. The K309 beam causes this torsional moment. If you cannot make improvements in the system, you can relase the right end of this beam, that is, you can put a joint. Or you can enter a small value for the torsional moment of inertia of the K324 beam. In the old calculation approaches, we used to place such simple beams to the main beam in such a way that they only give shear force. Now you know that the whole building system is being solved at once.