You are a data analyst at a retail company. You have a Tableau data source that combines two tables: Orders (containing order ID, customer ID, order date, and product ID) and Returns (containing return ID, order ID, return date, and reason). You need to analyze the return rate by product category. After connecting to the data, you notice that when you drag Order ID to the view, some orders appear multiple times. What is the most likely cause of this duplication?