Hi Alex,
In Moodle 1.9 with the standard theme using QuizPort to administer the jmt file with the "JMatch Sort from xml" output format, the quiz displays and behaves as expected (see screenshot).
Furthermore, in Moodle 2.8 with the standard theme using TaskChain to administer the jmt file with the "JMatch Sort from xml" output format, the quiz again displays and behaves as expected (see screenshot).
Please could you confirm that you are using the jmt file with the "JMatch Sort from xml" output format to administer this quiz.
I will try the same thing with the "Rocket" theme now. Is that a standard theme? If not, where can I get it?
cheers
Gordon