This could mean that the cached information on the Beyonwiz not correct, or that under your account on the IceTV website some channels have been disabled.
First thing to check are the details under your account on the IceTV website, to check these details run though the steps at How do I map channels on the IceTV website for my recorder? or Changing which channels are downloaded to my recorder.
Then you will need to clear the cache on the Beyonwiz and force an update of the guide by running through the steps at How do I clear out the cached guide and force an update?
Going through these steps and the guide should then show up correctly.