Bicopter / vtol confusion

I tried a bicopter servo/tilted rotor frame with frameclass 10 and advised servo outputs. Works quite well but when connected, usb connection displays COM6-vtol-dualrotor wich seems suspect. And for exemple yaw has impact on servos which is perfectly normal but on throttle as well. And it should not. Maybe it reacts as a vtol more than a Tilted birotor?
Thank you for your help!