There have been changes lately on Freeview where channel numbers have changed. As far as the TiVo itself is concerned the numbers will have changed automatically when you downloaded the guide data. What you need to do now is to retune you Freeview stb so it will put the channels on the right numbers.
Exactly how you retune will depend on the model of stb you are using. If you have the manual details should be in that. There is a general guide here
http://www.freeview.co.uk/Help/Retuning ... ning-guideThat freeview site has contact details for manufacturers, and links to downloadable manuals.
If you get stuck post back details of your freeview stb and if someone here has the same model they may be able to help.