Those are the apparent numbers. You're quite correct--although I would point out that in order to be as clear and straightforward as possible, I have used the statistics available on the American FBI site as well as Stats Canada. So these are the official statistics.
Unfortunately, Canada includes many more crimes in their violent crime rate than does the United States. Sexual assault is a much broader category of crime here than there, as is assault in general. So we have a higher violent crime rate because we have more actions called crimes.
If one tries to compare apples with apples rather than use the local definitions of violent crime, one finds that the violent crime rates are almost identical but the U.S. crime rate is slightly higher.