As FCeng84 commented, in flight mode 'roll demand' commands a rate of roll, not an angle of bank. A large sidestick input commands a large rate of roll, while a small sidestick input commands a small rate of roll. Zero sidestick commands zero rate of roll (ie a constant bank angle).
Also, in ground mode the aileron/spoiler movement for a given sidestick input reduces with speed, however, the elevator movement is not modified for speed - there is a direct relationship between the sidestick position and the elevator position.