Click not Working

Ionic Framework ionic-v3
1 
<ion-item  (ngTouch)="onDatePickerTap($event)"  >
    <ion-label floating   >DOB</ion-label>
    <ion-input type="text" [(ngModel)]="user.dob"  readonly   ></ion-input>
</ion-item>

this onDatePickerTap fire after 2nd click. what am i doing wrong. This works fine in the browser. Who else experienced this ?