Clear markers and put the selected [javascript]

Question

Hello

I am creating a script to remove the markers and put only the specific markers, but it is only working once if I then try to select another filter the markers appear all back and do not erase and put the specific markers, someone can help me with the script?

When entering the page:

With the Masc filter selected: (only Marker in port appears)

With the Fem filter selected: (the port marquer should disappear)

Fem Marketer as selected port Marketer should select, basically what you should do is delete the new old markers and mark the markers that select indicates... someone knows how to do this?

Code:

function LoadJsonData() {

  var jsondata;

  $.ajax({ 
      url: './json/dados.json', 
      dataType: 'json', 
      async: false,
      success: function(json){ 
          jsondata = json;
      } 
  });

  return jsondata;
}

var map;
var markers = [];

    
function initMap() {

    var jsondata = LoadJsonData();

    
    map = new google.maps.Map(document.getElementById('map'),
        {
            center: { lat: 38.736946, lng: -9.142685 },
            zoom: 7,
            });
            
            for (var i = 0; i < jsondata.length; i++) {
            var iconBase = './imagens/iconmapa2.png';
            var obj = jsondata[i];
    
            var marker = new google.maps.Marker({
                position: new google.maps.LatLng(obj.latitude, obj.longitude),
                map: map,
                title: obj.title,
                id: obj.id,
                visible: true,
                icon: iconBase
            });

            markers.push(marker);
        }    
}

 function setMapOnAll(map) {
    var iconBase = './imagens/iconmapa2.png';
    for (var i = 0; i < markers.length; i++) {
        if(markers[i].visible == true)
        {
            var marker = new google.maps.Marker({
                position: markers[i].position,
                map: map,
                title: markers[i].title,
                id: markers[i].id,
                visible: true,
                icon: iconBase
            });
        }
        else
        {
            markers[i].setMap(null);
        }
    }
  }

$(document).on("click", "#btnBuscar", function () {
    var filtroFaixaEtaria = $("#FaixaEtaria option:selected").text();
    var filtroSexo = $("#Sexo option:selected").text();
    var filtroRecursoArma = $("#RecursoArma option:selected").text();
    var filtroDistrito = $("#Distrito option:selected").text();

    var arrayResultados = jsondata.filter(function (item) {
        var criteria = true;

        if (filtroFaixaEtaria != null && filtroFaixaEtaria != "")
            criteria = criteria && item["Faixa Etaria"] == filtroFaixaEtaria;
        if (filtroSexo != null && filtroSexo != "")
            criteria = criteria && item["Sexo"] == filtroSexo;
        if (filtroRecursoArma != null && filtroRecursoArma != "")
            criteria = criteria && item["RecursoArma"] == filtroRecursoArma;
        if (filtroDistrito != null && filtroDistrito != "")
            criteria = criteria && item["Distrito"] == filtroDistrito;

        return criteria;

    });

    for (var i = 0; i < markers.length; i++) {
       
        markers[i].setMap(null);
    }    

    var iconBase = './imagens/iconmapa2.png';
 
    for (var i = 0; i < arrayResultados.length; i++) {
      var marker = new google.maps.Marker({
        position: markers[arrayResultados[i].id-1].position,
        map: map,
        title: markers[arrayResultados[i].id-1].title,
        id: markers[arrayResultados[i].id-1].id,
        visible: true,
        icon: iconBase
    }); 
    } 

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="escolha">
          <form id="selectsfiltro">
            <h6>Faixa Etaria:</h6>
            <select id="FaixaEtaria" class="custom-select">
              <option></option>
              <option value="1">0-17</option>
              <option value="2">18-25</option>
              <option value="3">26-35</option>
              <option value="4">36 ou mais</option>
            </select>

            <br />
            <br />
            <h6>Sexo:</h6>
            <select id="Sexo" class="custom-select">
              <option></option>
              <option value="5">Masc</option>
              <option value="6">Fem</option>
            </select>

            <br />
            <br />
            <h6>Recurso a arma:</h6>
            <select id="RecursoArma" class="custom-select">
              <option></option>
              <option value="7">Sim</option>
              <option value="8">Não</option>
            </select>


            <br />
            <br />
            <h6>Localidade:</h6>
            <select id="Distrito" class="custom-select">
              <option></option>
              <option value="9">Viana do Castelo</option>
              <option value="10">Vila Real</option>
              <option value="11">Bragança</option>
              <option value="12">Braga</option>
              <option value="13">Porto</option>
              <option value="14">Aveiro</option>
              <option value="15">Viseu</option>
              <option value="16">Guarda</option>
              <option value="17">Coimbra</option>
              <option value="18">Castelo Branco</option>
              <option value="19">Leiria</option>
              <option value="20">Lisboa</option>
              <option value="21">Santarém</option>
              <option value="22">Portalegre</option>
              <option value="23">Évora</option>
              <option value="24">Setúbal</option>
              <option value="25">Beja</option>
              <option value="26">Faro</option>
              <option value="27">Açores</option>
              <option value="28">Madeira</option>
            </select>
          </form>

          <br>

          <div class="botesdefiltrar">
            <button id="btnBuscar" class="btn btn-outline-warning">Filtrar</button>
          </div>
        </div>
        
        <div id="map" class="googlemap"></div>