If you enter anything into the "Payment instructions" box it posts it twice in the Event info page in the front end.
See this in real time here: http://www.dc-lan.com/component/option,com_mls_events/task,details/eventid,1/Itemid,56/
Well, I don't quite know how, but I fixed this nasty bug :)
Will be in the next version. If anybody wants the fixed file already, drop me an email.