@yab_tater
from the log file the 4 source files (mkv) and the 8 elementary output files (m2v, ac3) have all the same duration (24:29), thus there should not be issues during encoding. Do you mean that after authoring, the resulting DVD is missing 1 min video and audio is out-of-sync? Have you tried both with your PC and with a standalone DVD player?
Do you have the possibility to upload one mkv to test it?
Bye