Ion-content behind Ion-header when back button pressed in sidemenu app


I’m using Ionic 3 sidemenu app.

From sidemenu I’m selecting Settings, then in that I select Profile Settings, then Edit Profile and updating the form. After submitting it, when I press back button, my ion-content of the previous page is hiding behind ion-header. I don’t know where I’ve done mistake. Kindly suggest an Idea how to fix this