If your bow is back down in poundage it will increase your draw length and might change the ATA a small amount. It might be causing the draw length to be longer. My suggestion is to check it for poundage to see if it is at the max with the limb bolts turned in all the way. Your 1/8″ could be nothing to worry about. Just check a few other things like draw weight and draw length would tell you the string and cables are set properly.