You will notice that only the profiles of people with whom you interact regularly will be visible if you use the shortcut on facebook option. If you don't know why anything is happening, your actions and interactions are at fault. You must have a few selected, favourite profiles with which you regularly interact, view each other's profiles, and interact on posts.
When you are interested in reaching someone, you won't have to go through the trouble of searching and clicking because those profiles will be shown in your shortcuts. Therefore, you can simply click the shortcut to go through the profile.