Activity log dates

When viewing my activity log the entries for April are in MM/DD/YYYY format while the May entries are in DD/MM/YYYY format. I haven't changed anything and the log files themselves all seem to be in MM/DD/YYYY format. It's not a big problem but does mean the Date column doesn't sort properly and did give me a small scare when I first looked as all the May entries were at the top so I initially though my schedules hadn't been running.

 

They've swapped again. My activity log runs 11/05/10,12/05/10,05/13/10,05/14/10. Think it's just the view as all the dates in ISR.LOG are MM/DD/YY.