Error when generating dvd: some chapters aren't found and the video resolution is wrong

I'm trying to make a dvd and i split my title into 36 chapters. however, when trying to create an iso image of my project, it only finds 17 chapters and the generation fails. Additionally, i wanted it to copy my source's resolution of 1080 x 1920 (actually I'd be ok with a compression to 1080 x 720, but I didn't see that option anywhere), but when i checked the logs it said resolution: 720 x 480 for the video attributes. The issue persisted when I tried to just generate the ts files instead. How can I fix these issues? I have a copy of the process log, so if you have questions/theories I can check through there.

Thanks in advance!