RxJava2 success always called twice

Question

I'm implementing an MVP architecture with Retrofit, and RxJava2 (with RxAndroid). I have the following setup

NetworkInterface.java where retrofit calls lie

public interface NetworkInterface {
    @GET("/input")
    Single<List<InformationData>> getInfoData();
}

InformationDataDao.java Data access layer for the information data

@Dao
public interface InformationDataDao {
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    Completable createInfoData(List<InformationData> infoData);
}

MainPresenter.java where the calls are being made public class MainPresenter {

    public MainPresenter() {

    }

    // Method called to initialize the subscription
    @Override
    public void subscribe() {
        this.collectInfoData();
    }

    private void collectInfoData() {
        Single<List<InformationData>> singleInfoData = networkInterface.getInfoData()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread());

        singleInfoData.subscribe(informationDatas -> {
            InformationDataDao informationDataDao = database.informationDataDao();
            informationDataDao.createInfoData(informationDatas);

            // What made me detect that this was being called twice
            Log.d(Constant.LOG_TAG, "Info Data: " + informationDatas.size());

            // Rest of the code here
        }, Throwable::printStackTrace);
    }
}

SplashActivity.java The method that calls the presenter

public class SplashActivity extends AppCompatActivity {

    // Helps in getting the location
    private FusedLocationProviderClient locationClient;

    private SplashPresenter mPresenter;

    @Override
    protected void onCreate(Bundle savedInstance) {
        super.onCreate(savedInstance);
        setContentView(R.layout.activity_splash);

        mPresenter = new SplashPresenter();
    }

    @Override
    protected void onResume() {
        super.onResume();

        // These three lines ensure that you have the appropriate permissions to proceed. In the third line for instance, the user will be navigated out to the settings pane to turn on location.
        // When he/she returns to the activity, the onResume is called so I'm assuming that's the best place to start the presenter
        this.ensureHasPermissions();
        boolean isGoogleServiceAvailable = this.ensureGoogleServiceAvailability();
        boolean isLocationServiceAvailable = this.ensureLocationServiceAvailable();

        if (isLocationServiceAvailable && isGoogleServiceAvailable) {
            locationClient.getLastLocation()
                    .addOnSuccessListener(this, location -> {
                        // Set the closest location and subscribe
                        presenter.setClosestLocation(location);
                        presenter.subscribe();
                    })
                    .addOnFailureListener(this, Throwable::printStackTrace);
        }
    }
}

From the SplashPresenter.java, the log is printed twice, indicating that the complete callback was called twice. Is there any idea why this may be so? I'm quite new to RxJava2 and will greatly appreciate the feedback.

Thanks.