Post url error

Hello all

The snippet below is from Google clearly showing a url
http://www.cheaperholidays.co.uk/cheap-virgin-holidays/2007/12/24/84

Cheap flights Spain Turkey Egypt Canaries Florida PortugalJanuary 30th, 2008 by cheap-holidays in Cheap flights – February deals. … January February March April May June July August September October November …
http://www.cheaperholidays.co.uk/cheap-virgin-holidays/2007/12/24/84 – 25k – Cached – Similar pages – Note this

However we do not have a url with ID 84 for Virgin the correct id for virgin is 39

The URL with id of 84 is this one http://www.cheaperholidays.co.uk/cheap-flight-booking/2008/01/30/84

To correct this i have had to install a redirect plugin has anyone Else noticed this..

Kev