This is a bug in state saving of <ui:repeat> in Mojarra. There are several similar issue reports at http://java.net/jira/browse/JAVASERVERFACES, among others issue 2243.
You have basically 2 options: use another iterating component (e.g. <c:forEach>, <h:dataTable>, <t:dataList>, <p:dataList>, etc), or replace Mojarra by MyFaces (the <ui:repeat> in this construct works properly in there).