Глючит скрипт jquery.mobile.1.2.0.js
в строчке 3159:
//if the url is in the stack, it's a forward or a back
if ( decodeURIComponent( opts.currentUrl ) === decodeURIComponent( historyEntry.url ) ) {
//define back and forward by whether url is older or newer than current page
back = i < urlHistory.activeIndex;
forward = !back;
newActiveIndex = i;
}