I am getting some damage at the cable slide why is this happening to my string?

What causes this is that a very small piece of dirt or other foreign object has stuck to your string or in your Teflon slide and every time you draw and shoot its being pulled over this area cutting into the string or cable. This needs to be fixed right away by cleaning the Teflon slide and your string or by replacing the slide. If the damage is bad enough then the string should be replaced along with the slide to prevent this from happening to the new string. This is not covered under warranty.