I noticed if you create a server using SteamCMD the duplication not happens, but i still have crash o when zooning on the map. I'm using BRPVP mission (www.brpvp.com.br).

I also have this error and posted about it in https://forums.bohemia.net/forums/topic/219058-map-bugged-double-mountain-marks/?tab=comments#comment-3314629
Also the game crash sometimes when i firstly zoom in the map.