One of the MKV files, “03-TN1LFL” (that 10-second “Team Negative 1” Logo) has an AAC audio codec and it is not compatible with Blu Ray. The audio codecs on the other video files, DTS and AC3, are Blu Ray compliant.
One option would be to change the AAC codec on the video to an AC3 audio codec. Use the free software, Handbrake. Just load that video and select in the audio tab, AC3. As a result, it will give you a MP4 video of the TN1 logo with an AC3 audio bitstream. Save the MP4 video under the same title, “03-TN1LFL” and replace the MKV version (don’t delete it, just place the MKV version somewhere else). Then, try building your Blu Ray ISO again.
Good Luck