DVR trying to record Pay per View channel?

Well,

My wife is very upset right now. She is a huge women's soccer fan and twice during the last week, including today when the final was shown, instead of recording Fox Soccer Channel as we set it up to do ir failed and claimed technical difficulties. It then tried to record channel 504, a pay per view channel, which of course it tried and recorded for all of 2 minutes and failed.

Any ideas why it would do that?