onEdit several sheets

How do I make the onEdit function work independently on different sheets? You will see I made this script that works perfectly on the active sheet (Col Y). I have 8 sheets (different names) in which when modifying a specific column I stamp the date and time in the adjacent cell, for each sheet it is a different column. Try to do several functions onedit and none of them work. Thank you for your support.

function onEdit(event){
  var ColY = 25;  // Número de la Columna "Y"

  var changedRange = event.source.getActiveRange();
  if (changedRange.getColumn() == ColY) {
    // Una celda de la Columna Y ha sido editada
    var state = changedRange.getValue();
    var adjacent = event.source.getActiveSheet().getRange(changedRange.getRow(),ColY+1);
    var timestamp = new Date(); // Obtener la fecha actual
    // Dependiendo del valor de la celda será lo que se hará
    switch (state) {
      case 'Liquidado':
        // Escribir la fecha en la celda contigua
        adjacent.setValue(timestamp);
        break;
      case 'En Stock':
        adjacent.setValue(timestamp);
        break;
      default:
        // Algo que no se esperaba
        adjacent.setValue("*ERROR*");
        break
    }
  }
}