Does Your Preschooler Behave Differently at Home and at School?
This article clearly describes the often different temperaments parents and teachers observe in preschool and kindergarten children. It is common for your child to be focused and well-socialized at school, then "fall apart" when they get home. Adversely, many children have difficulty for various reasons sustaining their behaviour and focus during the school day. These parents are often shocked when the teacher describes a child that they "never see" at home.
Please read the article above for more insights on this important, developmental topic.