Ionic (V4) iOS Sidebar menu glitches when navigating trough pages

Ionic Framework
1

Hey there. I have released an app, which works seemingly fine on Android, but has a small issue, which I haven’t been able to solve on iOS. The application is available on both the Apple App Store & Google Play Store for download: Zoonoses 2019.

Issue:
When using the sidebar menu to navigate, the current page seems to slide under the new one, which is quite the looks killer, although not a huge problem. Is there any existing solution to this problem already? I will greatly appreciate any suggestions whatsoever.

Here is my Ionic Info on the mac book:

Ionic:

   Ionic CLI                     : 5.4.0 (/Users/ps-wt/.nvm/versions/node/v12.9.0/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.8.0
   @angular-devkit/build-angular : 0.13.9
   @angular-devkit/schematics    : 7.2.4
   @angular/cli                  : 7.3.9
   @ionic/angular-toolkit        : 1.5.1

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : ios 5.0.1
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.2, (and 19 other plugins)

Utility:

   cordova-res : 0.6.0 (update available: 0.7.0)
   native-run  : 0.2.8

System:

   ios-deploy : 1.9.4
   ios-sim    : 8.0.2
   NodeJS     : v12.9.0 (/Users/ps-wt/.nvm/versions/node/v12.9.0/bin/node)
   npm        : 6.10.2
   OS         : macOS Mojave
   Xcode      : Xcode 11.0 Build version 11A420a