i have made simple ion-navbar , in the header i made 3 buttons , when i running on the browser it is normally working , i test it on an emulator it looks like that .
<ion-header>
<ion-navbar color="leo">
<button ion-button menuToggle >
<ion-icon name="menu"></ion-icon>
</button>
<ion-title>{{ appName }}</ion-title>
<ion-buttons end >
<button ion-button (click)="goContactPage()" >
<ion-icon name="chatboxes"></ion-icon>
</button>
<button ion-button (click)="presentPopover($event)">
<ion-badge *ngFor="let n of nbr" color="danger" >{{n.total}}</ion-badge>
</button>
<button ion-button (click)="goAbout()" >
<ion-icon name="calendar"></ion-icon>
</button>
</ion-buttons>
</ion-navbar>
</ion-header>