Method give wrong return statement

public interface IProxy{
    public void getMap();
    public void initProxy();
}

public class ClientProxy implements IProxy{
    
    private Map mapClient;
    
    @Override
    public void initProxy() {
        mapClient = new HashMap<>();
    }
    
    @Override
    public Map getMap() {
        return mapClient;
    }
}

public class ServerProxy implements IProxy{
    
    private Map mapServer;
    
    @Override
    public void initProxy() {
        mapServer = new HashMap<>();
    }
    
    @Override
    public Map getMap() {
        return mapServer;
    }
}

@SidedProxy(clientSide = "mod.ClientProxy", serverSide = "mod.ServerProxy")
public static IProxy proxy;

public interface IProxy{
    public void getMap();
    public void initProxy();
}

public class ClientProxy implements IProxy{
    
    private Map mapClient;
    
    @Override
    public void initProxy() {
        mapClient = new HashMap<>();
    }
    
    @Override
    public Map getMap() {
        return mapClient;
    }
}

public class ServerProxy implements IProxy{
    
    private Map mapServer;
    
    @Override
    public void initProxy() {
        mapServer = new HashMap<>();
    }
    
    @Override
    public Map getMap() {
        return mapServer;
    }
}

@SidedProxy(clientSide = "mod.ClientProxy", serverSide = "mod.ServerProxy")
public static IProxy proxy;