Crossbow Sighting In

I recently acquired a slightly used crossbow. Started shooting it recently to get the feel of it, and to start practicing. Anyway, it shoots on at 25 yards, but when I back up to 35 yards, it is 4" left. I've never had this happen with my compound so I'm at a loss. Any ideas?

Thanks.

Scope was canted, clockwise just a smidge. All good now!