Hopefully this will work but i haven't been able to check a DL burn so save a copy of the original .IFO & BUP files first just in case
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Jambe, could you open your original VTS_01_0.IFO in IFOEdit ( feely available on the net) and could you tell me what your original files are reporting for the layer break. Might help to see if burning to a DL-R is adding the extra layer break