Weird padding in iOS ion-scroll


I have an ion-scroll container.
As soon as I add padding-top through the controller (calculated value), there appears to be an equal padding added to the border when running in iOS.
When previewing in Andoird the bottom border is not there.

Essentially code is really simple.
On the editor I created an attribute for the ion-scroll.
<ion-scroll ng-style = {'padding-top':scrollpaddingtop}>

In the controller, just a simple assignment of value.
$scope.scrollpaddingtop: '100px'

Any suggestions?