First member of the party only shows on map

CustomHero.js

/*:
 * @target MZ
 * @plugindesc Custom Hero
 * @author Steven
 *
 * @help Custom Hero.js
 * 
 *
 */

Game_Party.prototype.battleMembers = function() {
    return this.allMembers()
        .slice(0, this.maxBattleMembers())
        .filter(actor => actor.isAppeared());
};

Game_Party.prototype.allMembers = function() {
    return this._actors.slice(1, this._actors.length-1).map(id => $gameActors.actor(id));
};

Game_Party.prototype.leader = function() {
    return this._actors.map(id => $gameActors.actor(id))[0];
};

Game_Party.prototype.swapOrder = function(index1, index2) {
    index1++;
    index2++;

    const temp = this._actors[index1];
    this._actors[index1] = this._actors[index2];
    this._actors[index2] = temp;
    $gamePlayer.refresh();
};

Game_Followers.prototype.setup = function() {
    this._data = [];
    for (let i = 0; i < $gameParty.maxBattleMembers(); i++) {
        this._data.push(new Game_Follower(i));
    }
}