Yes, i was adding up all Keystone Initiate / Challenger / Conqueror / Master achievements, but this was inflating the numbers (Initiate has them all). Normal / heroic / mythic zero were ignored before but are added now.
The progress bar currently shows your overall progression from 0 to the next breakpoint. I did not expect people would care if it was overall or specific from one breakpoint to the next, so i did not really bother. However you are not the first to report this, so i am considering changing this.