当我添加removeMarker函数时，每隔5秒在地图上加载图钉不会显示图标

i am refreshing google maps JSON file every five seconds to get new pins, whenever i do any changes in the database and add new pins, they show up on the map, but the weird thing is when i remove the coordinates of a pin from the database the pin does not disappear from the map, rather stay there,i am refreshing google maps JSON file every fiv