When creating a burr, you may have focused on only one side. We suggest doing 10 strokes down one side and feeling for a burr. If you don't feel one, switch to the other side and repeat the process. Continue this until a burr is formed down both sides. This ensures even metal removal from both sides of the blade. The knife is leaning to one side. Fully flat ground blades are the biggest culprit. Use a shim to steady the blade and straighten it in the vise. The vise jaws are bent. Close the vise completely and make sure both sides of the jaws are in full contact with each other. The angles and/or micro-adjusts are not set equally.