Samsung DVD R145 captioning problem



My Recorder is connected via RF cable and when I view or try to record a program through the DVD Recorder, the captioning font become stretched and enlarged where at least three letters are cut off on the left margin. I tried adjusting picture aspect ration on both the DVD recorder setup as well as my Toshiba HD LCD, also setting on my Time Warner HD cable box but viewing and recording is still bad on the captioning. I have the font settings as small as possible on my TV for captioning. My Pioneer DVD recorder with the signal coming in through the L1 is fine and captioning fine. I called Samsung and their techicans have no clue how to help me. I just bought the recorder a week ago. I have the DVD recorder connected to the TV by HDMI cable. Help!