IONIC 4 Segment update issue

Ionic Framework
1

Hi All,

I have 2 pages in my application and to navigate these two pages I used routerLink property.

I have segment on those two pages and one page contain user list as location wise. The location will be my segment in my first page

<ion-segment [(ngModel)]="deparmentSelSegment" class="main-tabs">
    <ion-segment-button value="SA">
      <ion-label>South africa</ion-label>
    </ion-segment-button>
    <ion-segment-button value="India">
      <ion-label>India</ion-label>
    </ion-segment-button>
  </ion-segment>

On 2nd page i have user details divided in segments

` <ion-segment id="userProfileSeg" class="main-tabs" scrollable [(ngModel)]="userData" #Content>
      <ion-segment-button value="0" checked layout="icon-start" id="segment0">
        <ion-label> Profile</ion-label>
      </ion-segment-button>
      <ion-segment-button value="1" layout="icon-start" id="segment1">
        <ion-label> Rewards</ion-label>
      </ion-segment-button>
      <ion-segment-button value="2" layout="icon-start" id="segment2">
        <ion-label> Questions Asked</ion-label>

      </ion-segment-button>
      <ion-segment-button value="3" layout="icon-start" id="segment3">
        <ion-label> Reactions </ion-label>
      </ion-segment-button>
      <ion-segment-button value="4" layout="icon-start" id="segment4" *ngIf="userDetails?.isAdmin =='true' || userDetails?.isQAAdmin  == 'true' && userDetailsData?.userId == userDetails?.userId ">
          <ion-label> My Broadcasts</ion-label>
        </ion-segment-button>

    </ion-segment>`

When i changed my location for SA to India on first page and then click on any user It redirects to User profile page and when I changed tab in user profile ngModel value on first page becomes blank.

I dont have any idea why this is happening.Any help would be appriciated.

Regards,
Swanand