It appears other players noticed your 104.5K Dust. In order to earn Dust, you must salvage legend and legend+ gears. Every legend salvage yields 5 dust. Therefore, you should easily be in the top 30 of the legend found leaderboard, at a minimum.
Simple Illustration - 104,500 Dust/5 Dust per legend = 20,900 legends found.
New feature in 3.0 - Dust.
Which IGN belongs to you?