DVR records old episodes as if they were new

My previous posts on this subject seemed to have disappeared.  Also there seems to be some other discussion on the same topic.  My DVR tries to record old episodes of shows as "New" if they aren't marked in the guide as either "New" or "Repeat."  I set the DVR to record a series, and to record "New Episodes Only" but I end up with it scheduling several old episodes as well as the new ones.  Specfic example: Ridiculousness - the DVR scheduled 27 old episodes (as well as the new ones) and each of those old episodes are not marked in the guide as either New or Repeat.  I have to go in and cancel each old episode to be recorded.