It is common for riders to accidentally teach their horses undesirable behavior by releasing the pressure of an aid at the wrong time. Be mindful of only rewarding behavior that you actually want.
"Incorrect training is as if you buttoned a sweater wrong. In order to fix it you must unbutton it and start over again." ~ Reiner Klimke You cannot just add another layer over the top and expect it to be right!
Horses speak through actions. Try to listen to what they are telling you.
"At the beginning, the horse should have a long neck, and be really going into the bit, and that I am able to always have steady contact with a willingness of the horse to go forward. They are a little down at the beginning when I do my warm