Is the belt old and in need of replacement? If you replaced it Have you done anything besides replace the belt? Remove or replace any pulleys? It does look like it might sit in towards the engine a little but hard to tell by the photo. Did the belt seem to lay naturally in line with all pulleys before the tension was applied? Double check the belt length and groove quantity. Compare it next to the old belt. If the belt is correct and you did nothing to the engine then I don’t know. Good luck!