[Vuejs]-Getting data from json in order to fill a datatable

this is unnecessary:

getGamesAll(){
 return this.$store.getters.getGamesAll.games
}

because you already have it using mapGetters:

...mapGetters(["getGamesAll", "getUserLogged"]),

if your getter getGamesAll have data then this should simply work:

<tr v-for="(general, index) in getGamesAll.games" v-bind:key="index">