I am reading Adobe Illustrator CC Classroom in a Book 2015 release. In the section of A Quick Tour of Adobe Illustrator CC (2015 release), the author asked me to select the Line Segment tool to draw a line. Afterwards apply the brush style to the line by choosing Windows > Brush Libraries > Borders > Borders_Novelty and selecting Laurel brush. But the final visual effect what I got is different from the one in the book. My artwork is like:
Why do they look different? Where does the difference come from and how to fix it?