Before Image is

The output Image is

MY command is
Convert -bordercolor white -border 1x1 d:/checks.png -matte -virtual-pixel white -filter point -bordercolor grey -border 1x1 -distort Perspective "0,0,0,20 0,98,0,70 10,98,10,98 10,0,10,0" +repage -verbose -filter point -quality 100 d:/output.jpg
Selected portion distorting correctly why it change next part of image.
Anybody can tell me