One of the reasons is that certain transitions on an LCD take longer than a 60hz frame, or 16ms. While LCDs commonly claim 4ms or 8ms response times, that only counts for very specific color changes. There are still plenty of LCD cell changes that take +40ms. You have found the types of color changes that take longer than a frame or two on your display.
In addition, blur and motion filters are quite common in games, in an attempt to hide their commonly 20-30fps nature on consoles.