Your graphic gives SBD as the units. The Steemit wallet says "in US dollars":

My understanding is that 1 SBD currently = 0.59 USD. (Would that explain the 40% discrepancy?)

If the way Steemit is doing it now is correct, why did they suddenly change it to this way a few months ago? My estimated worth went from $500 to $800 in an instant. Sounds like I'm not the only one.