If you find that the icing smears or smudges the design when you lift the stencil, there are a few possible reasons. First, make sure that the icing consistency is appropriate. If it's too thin or runny, it's more likely to blur the design. Adjust the thickness of your icing by adding more powdered sugar if needed. Additionally, try to remove the stencil smoothly and quickly after applying the icing. Lift it gently and avoid any unnecessary contact with the fresh icing. Lastly, ensure that the icing has fully dried before adding any additional decorations or layers to prevent smudging.