What does 1 Samuel 6:15 mean?

The Levites took down the chest of God and the box with the gold objects, and set them on the big rock. The people of Beth Shemesh offered burnt offerings and sacrifices to the Lord that day. 1 Samuel 6:15 - Modern Text Bible

(The Levites, who are supposed to handle holy things, take care of the Ark, and the people celebrate with more sacrifices.)