No solid line

Hello,

the line which I mark yellow is not solid on iOS.
It does not look good, could someone help please.

Here is my code

<ion-content no-padding>
  <ion-list-header>
    Personal
  </ion-list-header>

  <button ion-item (click)="changePersonal()">
    <ion-icon item-left></ion-icon>
     Dummy Dummy
  </button>

  <ion-list-header>
   Hobby
  </ion-list-header>

screen