I noticed on a chef's knife I sharpened for a neighbor, and on a few of my own knives, that sometimes I leave a small divot right in front of the choil/plunge grind. Its 1/4" to 1/2" in front, and, now that I've noticed, seems to be on most blades I've sharpened more than 2 times. I had a Kershaw Vapor that I sharpened on the sander most of the times it needed sharpening, but it was recurved anyway, so I didnt notice it there. Does anyone else have this problem, and does anyone know how to fix it? I'm using a Harbor Freight 1x30 with a 180 to 320 grit belt (which ever is cheapest and most available; its happened on all the grits) from either Klingspor or Fastenall. It happens sharpening edge trailing, leading, w/ or w/o the platen as a backing.