Many students training to fly helicopters make poor control coordination mistakes because learning the helicopter's controls is hard in the beginning. Helicopter controls the cyclic collective and pedals all work together and must be moved smoothly and correctly at the same time. Beginners often rely on big or sudden movements instead of gentle actions. This makes the helicopter feel unstable and harder to control.
One main reason is that new pilots simply do not yet understand how sensitive the controls are. Unlike cars or many other machines a helicopter responds strongly to small changes in control inputs. If a student moves the cyclic too much, the helicopter can sway or tilt unexpectedly. If they press the pedals unevenly the helicopter can drift sideways or turn without meaning to. These reactions make it tough for a learner to keep the aircraft steady.
Another reason students make poor control coordination mistakes is stress and mental overload. During early training students must focus on many things at once instruments outside view, instructor instructions and calm breathing. When beginners concentrate too much on one thing for example watching the ground while hovering, they forget another part of flying. This leads to rushed or uneven movements with the controls.
Also, many beginners try to correct errors too fast. Instead of using small, steady movements to fix a slight drift they make big corrections. This over-controlling causes the helicopter to swing more, which then requires yet more corrections. As a result, the problem gets bigger instead of better.