It's probablly just lack of consistent cues like the others said. I don't know too much about teaching them because my past two horses learned them on thier own. They wern't fancy, just a pony and a quarter horse, both non trained. They just got to the point where they were so fit that they just did automatic flying changes without me asking. The pony just started doing them on the flat and the quarter horse after jumps. After then they would usually give me automatics whenever they were on the wrong lead, or when I asked. The pony is a lesson horse and the quarter horse is my best friends eventer/hunter and is also a lesson horse they both still do it. The pony is 16 with arthritis, and the quarter horse is around 12-14 so im not sure its age unless she's older
"Riding is not Equitation... The moment you believe it is, is the moment you quit riding."