It could be that the coach didn't have a clear understanding of the story's core or didn't communicate it effectively to the children. Another reason might be that the children had different levels of comprehension and interest, causing inconsistencies.
Maybe the coaching methods were not suitable or the story was too complex for the children to grasp consistently.
The inconsistency could stem from a lack of proper planning during coaching. Maybe the coach didn't break down the story into manageable parts or didn't provide enough examples to make it consistent for the kids to follow.