[EventCalendar] Monthly listings are in wrong order

[claire circuit]

Hi all,

When viewing my monthly listings, the posts are all in the wrong
order. It looks as though they are ordered using the date posted
(reverse order) rather than the event date.

http://www.copsandrobbers.net/?m=200805&cat=2

I am using WP2.2.3 and 3.1.1._rc3

Can anyone help me fix this, please?

Thanks
Claire