iOS Webview is twitching when i use form input

I create special video to explain it more correctly Video . I see this bug only on iOS platform, on Android it works fine. That's code for form, that i use:

<div class="list list-inset list-inset-margin-bottom baby-bg-main">
 <form>
 <p>Enter your login data to connect your account with facebook</p>
  <label class="item item-input">
   <input type="email" ng-model="user.email" placeholder="{{'EMAIL_ADDRESS' | translate}}">
  </label>
  <label class="item item-input">
   <input type="password" ng-model="user.password" placeholder="{{'PASSWORD' | translate}}">
  </label>
  <button ng-click="setFacebookToken();" type="submit" class="button button-baby" style="width: 100%; margin-top: 5px;margin-bottom:40px; height: 50px;">{{'LOGIN_BTN' | translate}}</button>
 </form>
</div>