Fork spring preload settings are taken starting by fully winding in the adjuster and then backing out to have 2.5 turns showing.
This is the same for rear shock rebound adjustment; screw the screw fully in, then back off the required number of turn and part turns.
I think Suzuki use this now, as they do count the top surface flat of the adjuster as a line. They used to say 'lines showing' and expected you to be aware of their 'invisible' top line start point, but who did?
Likewise, they start counting the clickers at the first fully audible click as 1, not 0. Turns out, as against clicks is a better system in my view.