Trouble with DVR recording the right shows.

I am having trouble with my DVR recording one specific episode of a series or one specific show. For example, let's say it is currently 11 A.M. and I would set my DVR to record something that doesn't start until 5 P.M. When I hit the record button on the 5 P.M. show the DVR automaticlly starts recording the show right then (at 11 A.M.) even if the show techniclly hasn't even started yet. If I allow the DVR to continue recording it will record everything that comes on between 11 A.M. and 5 P.M. even if I did not tell it to record anything but the one 5 P.M. show. I have tried resetting the receiver but, it did not fix the problem. Does anyone know how to correct this issue or has anyone else had the same problem?? It is very frustrating when you have to fast forward through 5 hours worth of recorded t.v. just to get to the one show that was meant to be recorded. Thanks in advance for anyone's help.