Bootstrap modals don\'t work correctly on Android and iOS. The issue tracker acknowledges the problem but does not offer a working solution:
Modals in 2.0 are broke
you can add this property globally in javascript:
if( navigator.userAgent.match(/iPhone|iPad|iPod/i) ) {
var styleEl = document.createElement('style'), styleSheet;
document.head.appendChild(styleEl);
styleSheet = styleEl.sheet;
styleSheet.insertRule(".modal { position:absolute; bottom:auto; }", 0);
}