Quick answer
Decision-making authority and the schedule of residence are separate subjects.
Do now
Read the order’s exact language about school, medical care, religion, emergencies, and communication. Identify the particular decision in dispute. Ask for clarification or modification through the correct court if the wording leaves a recurring problem.
Watch for
“Joint custody” does not necessarily mean equal overnights or permission for either parent to make every decision alone. Avoid relying on a label without reading the terms.
Official sources
NJ Courts — FD modification application packet, NY Courts — Custody and Visitation, DC Courts — Family Court Self-Help Center.