When the end user connects to the guest Wi-Fi, automatic browser pop-up will come with the splash page. This pop-up browser does not support modern browser features and due to that splash page which appears with a pop-up browser will not support some of styles and java scripts.
How to Stop Browser Pop-up
Since this is a behavior of a mobile it cannot be controlled by IPERA Starling platform. If you need to stop this browser pop-up following URLs need to be added to the walled garden.