ttyS0 is adding itself in inittab

Hello everyone !

I'm using alpine linux in a Raspberry pi 3.
I've yet to understand why when I try too remove the login console (ttyS0) it keeps adding itself in inittab when I reboot :

# enable login on alternative console
ttyS0::respawn:/sbin/getty -L 115200 ttyS0 vt100

Basicly if I comment the line it just pop another one, and If I remove it, the same thing happen.

before anyone asks, I do "lbu ci -d" before rebooting :)

someone having a clue here ?