Check your stirrups length carefully and also some leg and balance workout can help, and lots of riding pratice!
Hope I helped :)
Yes I have checked my sturrip leinght and I every day a I do no sturrip work for my worm up
Have you checked your stirrup length? This can happen if your stirrups are too long sometimes. Otherwise it's simply a case of doing some stirrup less work to improve your core stability and to stop you from relying on your feet for balance.
Hope it helps 🙂