Fair Use Wizard seems to have a bug? Split Chapters

Fair Use Wizard seems to have a bug: a DVD with a single program chain of duration 2:08 with three chapters of roughly 40 minutes each, when ripped with the option 'Split chapters' and total filesize 540 MB, gave 2 files of 180 MB and one of 70 MB, and also the 3 files were of 37 minutes duration! Doing the rip without the 'Split chapters' option => proper file, no more problems.