Examples of common positional mistakes - Riding to long
Riding with your stirrups too long reduces your ability to be balanced as you are stretching for your stirrups
It can cause you to have an unstable seat
This applies to dressage and jumping
It limits your correct leg aids as you can’t keep your leg on as you are trying to stretch into your stirrups but are unable to have the weight through them.
As your body is unbalanced this will affect your contact and it will become inconsistent.
To correct this make sure your stirrups are the correct length for you to be comfortable and able to keep your balance and give the correct leg aids.