Varnish returning incorrect page

[Aaron de Souza]

Hi,
I'm running Varnish 3.0.2 on an Ubuntu 10.04 Server.
I have a strange problem with Varnish in that it is returning the wrong page for particular URLs.
For example, I have URLs like

http://mydomain.com/events/booking/20120907
http://mydomain.com/events/booking/20120905
http://mydomain.com/events/booking/20120904
http://mydomain.com/events/booking/20120717
http://mydomain.com/events/booking/20120713

If I first visited the url /events/booking/20120905 it caches the page and then if I then visited /events/booking/20120907it returns the cached page for /events/booking/20120905.
If I then try and visit /events/booking/20120717 the correct page is returned and cached, but the if I visit 
/events/booking/20120713, the cached page for /events/booking/20120717 is returned. It seems like pages are being hashed with the last two digits of the URL ignored (does that make sense ?!?). Has anyone come across behaviour like this before?

Many thanks
Aaron
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