Google maps api info window triangle position is wrong

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Google

Google-Maps

google-api

  var infowindow = new google.maps.InfoWindow();
    var latLngSet= new google.maps.LatLng(%#Eval("lat"), %#Eval("lng"););
    var marker%# Container.ItemIndex%; = new google.maps.Marker({
    // The below line is equivalent to writing:
    // position: new google.maps.LatLng(-34.397, 150.644)
        position: latLngSet,
        map: map,
        icon:'../images/marker/kirmizi.png',
        title:'%#Eval("IsletmeAd")',
        zIndex:99999
    
});

 marker%# Container.ItemIndex%.addListener('click', function() {
              var contentString  = '<div class="col-md-12" style="font-size:17px;">'+
                                   '<div class="h3 pad0 mar0 "><img height="30" src="../images/marker/kirmizi.png"/> <%#Eval("IsletmeAd")%></div>'+
                                   '<div class="col-md-12 pad0 padt5 mar0">%# YurtTipi(int.Parse(Eval("Konsept").ToString()),int.Parse(Eval("ogrenciTip").ToString()))%</div>'+
                                   '<div class="col-md-12 pad0 mar0">'+
                                   '<span class="fa fa-map-marker"></span> <%#Eval("bolge")%>  '+
                                   '<span class="fa fa-user"></span> <%#Eval("kapasite")%>'+
                                   '</div>'+
                                   '<div class="col-md-12 pad0 mar0 padt10" style="text-decoration:underline;"><a href="/KB/answers/Detay.aspx"?%# cevirici(Eval("IsletmeAd").ToString())%&id=<%#Eval("IsletmeID")%>">Detayları Gör </a></div>'+
                                   
                                   '</div>';
            infowindow.setContent(contentString );
                
                
                if (infowindow) infowindow.close();
                infowindow.open(map, marker%# Container.ItemIndex%);
            });

This code block is my map api codes but info window doesn't work correctly so there is space between info window and triangle. I don't want it. How can I fix it ?
Image[^]

What I have tried:

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