It is because your map has already stored them before on a different location, as soon as you place new place able items on a map, such as doors, puzzles etc, they will not appear normal or work until you
physically delete the .sav file that is created with your map. This will also then cause the map to be wiped and started fresh.
The .sav file contains all the locations of every item, and if the server cannot find these items, they are removed, and new ones will not be loaded until it is wiped properly.
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