Incorrect calculation of the height at the open keyboard

Hello. I have a problem. When I set the focus to text field in modal view, opening keyboard and incorrect calculation height content.

Cordova CLI: 6.1.1
Ionic Framework Version: 1.3.0
ios-deploy version: 1.8.6
ios-sim version: 4.1.1
android version: 5.1.1

index.html meta tag:
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width, height=device-height">

Device ready event:
ionic.Platform.isFullScreen = true; if (ionic.Platform.isIOS()) { cordova.plugins.Keyboard.disableScroll(true); }

what’s the problem?