Deleted waypoint reappear on reload

I created a waypoint on a map with a white banner. Then I destroyed the banner. I had the map with me, so it updated it. But now when I reload the world (restart the server) the waypoint reappear on the map. No matter how many times I go to the place where the banner was, to reupdate the map, the marker reappears every time the world is reloaded.

Attached screenshots showing the problem : 1st screenshot showing the marker before approaching it, 2nd screenshot showing the marker being removed by map update, 3rd screenshot showing the marker reappearing after reloading the world.