What are the major causes of the improvement for Home Depot and the decline for Lowes?

Paper details:

This a group assignment. I am doing number 2.
2. Between fiscal 2017 and fiscal 2018 Home Depot improved its profit margins by over 170 basis points while Lowe’s profit margins decreased by over 170 basis points. What are the major causes of the improvement for Home Depot and the decline for Lowes?