DVD-Rs showing up as CD-R Nec ND3550A

Hi there,
I’m not expert with this stuff, bear with me.
Using ND-3550A with bootflash/firmware flash hack to 4551…
When I put in DVD-Rs i burned before reformatting my computer they show up as blank CD-Rs. If i open ISO buster i can view the filenames, but not extract anything. I have 5 total DVD-Rs acting like this, with the first one i tried ejecting and putting it back in… worked after about 15 ejections, the rest won’t budge. Any idea what’s going on?

Thank you