I enlarged your chart by 500% to look at it. I know what you are talking about. Color charts always make things in stair steps and sometimes the automatic chart makers have some squares not all filled in. You just have to decide if that square would look better worked in the background color or the design color. You might choose to knit the stitch in the color that it is predominately, for instance if the square is mostly white with just a little corner of blue, make it white. If it is half or more blue make it blue. Half or more white make it white.
Your chart as it came up had a lot of squares. You would have to have a lot of stitches for that chart. The more squares the more detail you have and the less each stitch matters so much, when the stitches are big each one matters more, if you know what I mean. But you are making a hat here, and not a sweater. :lol: