iOS 11 scroll bouncing with ionic 3.9.2

I’am using ionic 3.9.3, and created a login page,by default it is adding scroll in page and when I’m pulling down the content and at the time of touch release it is showing some glitch/bounce.
I have already tried the no-bounce but no luck.
please guild me how to resolve it thanks.

Expected Behavior
it should not add scroll by default, when keyboard opens content should scroll without jerk/bounce with smooth scrolling

Ionic Info

cli packages: (/usr/local/lib/node_modules)

@ionic/cli-utils  : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : 8.0.0 

local packages:

@ionic/app-scripts : 3.1.9
Cordova Platforms  : android 7.0.0 ios 4.5.4
Ionic Framework    : ionic-angular 3.9.2


Node  : v8.11.2
npm   : 5.6.0 
OS    : macOS High Sierra
Xcode : Xcode 9.4.1 Build version 9F2000 

Environment Variables:

ANDROID_HOME : not set


backend : pro