Multiplayer, replication

If i use a ressource like i.e. Stone on the ground and want to get this ressource the Stone amount would substract over time. This works fine on both sides server and client. But only the client can see the updated number of stones on the ground if the serverplayer (host) is gathere it.
The client can also gathere the stones but the number dont change on server screen. How should i have to replicate this?