createConfirm showing data twice

Hi.
I am trying to save new data on server with firebase.
My issue when I set it with
` (createConfirm)="onCreateConfirm($event)"`

and my function:

```
onCreateConfirm(event): any {
this.service.createData(event.newData);

}
```

I can see that table starting showing same data 2 times, One from my server db firebase and second somehow the table added itself. how to fix it?

link to q from [stack](http://stackoverflow.com/questions/40430893/ng2-smart-table-create-button-not-working-correctly)