Scaling a layer using Touch - scales whole app - Bug?

I am using the touch plugin to zoom a layer using a pinch gesture.

When full screen is OFF - All is OK.

However here is the issue.

If fullscreen is anything other, when you zoom (or scale the layer DOWN) the whole application/canvas also scales down?

The issue is, to export to mobile you NEED to have the fullscreen option.

Is this a Bug? Anything i can do?

Thanks