It's because your account "Dufyman" was not available on the RuneScape high scores when you gained those levels. I see in-game that your previous display name was "II Goofer II", so it's likely that you gained those levels with that display name but failed to update your display name on RuneTrack to allow those level gains to be tracked in real time (or gained those levels in the time period between when you switched back to "Dufyman" and viewed your User Profile to re-activate it).
However, now that your RuneScape display name is now "Dufyman" again, all future gained levels will appear in the Recently Gained Levels chart. Though in the future if you ever change your display name again, remember to update it on RuneTrack as well.
