That can be part of learning.
A session does not have to look smoother at the end to have been useful. If you have introduced a new way of seeing the game, players may temporarily become slower because they are consciously thinking about something that was previously automatic.
The question is whether the mess is connected to the learning problem.
If the players are confused about three different instructions, the session may be overcomplicated. If they are repeatedly noticing the right picture but getting the execution wrong, I would be more patient.
Afterwards, ask yourself what the players were trying to solve, how often they saw that problem and whether your interventions made the decision clearer.
At U13, I would rather a session contain useful struggle than look tidy because the players already know every answer.
Messy is not automatically good. But tidy is not automatically learning either.
