Oil change, front fork

Hyosung GT650 Comet-06
Hi there.
With empty tubes, front fork manual tells:
“Oil level 146mm (5.8 in) from end of outer tube
(when maximum compressed without spring)”
or/and 380 cc.
The recommended level is obtained with 380 + 60 cc at each leg.
Anyone who can explain ‘wass’up’?
The hight of inner thread, from top to ‘top of outer tube’ (oilfilled) is 25 mm. So measure top(top) 😋 to oil is 171 mm.