Liteon 1633s@16533s Probs?

i use a program called 1clickdvd and copy 2 dvd. when i get done backing up a movie using 8x burning at 8x it will not finalize the disk but if turn the burn speed down to 6x everything works great?? is this something i should not even worry about or is something going on with my drive??

my drive is a 1633s@1533s with cstr firmware patched with omipatcher by
c0deking (thanks c0de)

i am also using fugi 8x made in japan YUDEN000T02

any ideas??

well i found the problem i think i switched to CSOM firmware and all is fine!!