im running into an issue where my models are shorter then expected

when I measured 100mm ends up being 96.31mm
so i was trying to update my Z steps

In Marlin i set it to 6400 steps
but when I connect to the printer, the feed says the following

Steps per unit:
M92 X80.00 Y80.00 Z12800.00 E541.06

Why does it say 12800 steps if i set 6400 steps in marlin
using 1/8 microstep

is it just doubling it since its not using 1/16 micro?