Not syncing hands & fee
Both feet must be making a move of the same distance at the same time and be sure of sync your arm and feet because you can’t just be standing when you punch.
Lack of balance
Need to have a strong leg, always keep your knees slightly bent and, in that way, you will have a well planted foot.
Just move forward and backward
Remember you can be creative, you can move to the sides, in circles, create angles. In that way, you’ll be less predictable.
Some of the exercises to improve your boxing footwork can be done anywhere.
Practice with an imaginary opponent doing Shadow Boxing will help your sparring. Box Jumping for more energy when you bounce around your opponent and can do it with double feet, single step or the most common that is marching.
Every boxer trainer will tell you to Practice with Jump Ropes. Is one of the basics for foot coordination, breathing techniques and resistance.
So now you now hat you are doing wrong and how can you fix it, remember you can do these exercises outdoors and with no trainer.