Hi, @gabechan
Welcome to the forum.
Please read the post at the start of any forum , entitled "How to use this Forum".
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Are you using the IC on its own or a module PCB with the 9548?
Are you permanemtly connecting A0 -A2 pins to gnd or Vcc?
Thanks.. Tom... 
