Close ark, go to your mods subscriptions, unsubscribe the map. BUT find the maps number, this is usually shown in the URL for that mod. https://steamcommunity.com/sharedfiles/filedetails/?id=xxxxxxxxxxxxxxxx
the numbers after = is your mod id. With this number, go and find the folder and mod file that match it in the ark mods directory ON YOUR PC.
Now, go to the steam page for the DLC map and hit download again. Let it work, then let it install when you open ark, This should get your problems fixed and sorted