I have a JVC DVD. I have a JVC DVD & HDD video recorder (DR-MH30S). I use it regularly to

Question

I have a JVC DVD & HDD video recorder (DR-MH30S). I use it regularly to record to hd, but cannot dub successfully to dvd. The dvds work in that machine but not in any other dvd players, or even my laptop.Tonight, I tried recording straight to dvd which worked. Just wondering why I can't dub.