[Vuejs]-Vue $on fires console.log but won't chance local properties

Try to change to arrow function to allow access to the component this

window.events.$on('selfAddLike', (data) => { // use arrow function here
     this.isFavorited = true;
     this.favoritesCount = this.favoritesCount + data;
});

window.events.$on('selfRemoveLike', (data) => { // use arrow function here
     this.isFavorited = false;
     this.favoritesCount = this.favoritesCount - data;
});