Strange readings-very low reencoding on BD9?

[LignGeorge]

I noticed something very strange: when I tryed to compress the legend of zorro to BD9 without selecting remove hd audio the quality was 25%.So far so good but when the compression begun I saw video reencoding to 2535kbps .I canceled it because that's weird.Then I selected remove hd audio and the quility raised to 29% and when the compression begun I saw video reencode to 7037kbps.How is this possible?The source is ''only'' 31 GB the difference should be less,with the original hd audio the video shoud be at about 6000kbps or the source over 300GB.Is this wrong calculation ,wrong readings, will be the video with hd audio REALLY BAD?
DVDFab 7.0.9.3 (2010/08/10 22:12:29)

0m 00.64s: option dvd2dvd 1 dvd2mobile 1 bluray2bluray 1 bd2mobile 1 file2mobile 1 filemover 1
0m 04.77s: detected blu-ray
0m 04.86s: drive G
0m 04.88s: blu-ray type 1
0m 04.88s: volume label LEGEND_OF_ZORRO
0m 19.56s: root 8C9F355E849BB422_VOLUME_SET_ID:LEGEND_OF_ZORRO:LEG END_OF_ZORRO:LEGEND_OF_ZORRO
0m 21.15s: aacs 1 bd+ 0
0m 22.01s: got discinfo
0m 22.10s: got bdmv
0m 22.16s: got agid
0m 22.44s: sent host cert chal
0m 22.74s: got drive cert chal
0m 23.16s: got drive key
0m 23.16s: got host key signature
0m 23.18s: verified drive signature
0m 23.18s: verified host signature
0m 23.69s: sent host signature and key point
0m 23.69s: got bus key
0m 23.74s: got volume id
0m 23.74s: got volume id mac
0m 23.74s: volume id is correct
0m 23.74s: got vid
0m 23.83s: blu-ray D745B8740251C9D73760F4884EC7C0D08FA4A38A
0m 26.80s: got vuk
0m 26.87s: got unit key 1
0m 34.63s: got extended bdinfo

WITH HD AUDIO
13m 11.92s: compress begin: Blu-ray groups clips(00011.m2ts), playtime(7827820 ms), size(38577 MB)
13m 11.92s: processing source(00011.m2ts)
13m 11.92s: try to use gpu acceleration(1) for video decoding
13m 26.19s: filter(13): the video frame mux index(189->188) is not correct.
13m 28.07s: group(00011.m2ts ) playtime(7827820 ms) source(38577 MB) request(8019 MB) real(8 MB) bitrate(2535 kbps)
13m 28.07s: compress finished: groups request(8019 MB, 8019 MB) real(8 MB) average_bitrate(2535 kbps)

WITHOUT HD AUDIO
13m 48.27s: compress begin: Blu-ray groups clips(00011.m2ts), playtime(7827820 ms), size(38577 MB)
13m 48.28s: processing source(00011.m2ts)
13m 48.28s: try to use gpu acceleration(1) for video decoding
30m 14.97s: group(00011.m2ts ) playtime(7827820 ms) source(34190 MB) request(8019 MB) real(965 MB) bitrate(7037 kbps)
30m 14.97s: compress finished: groups request(8019 MB, 8019 MB) real(965 MB) average_bitrate(7037 kbps)
30m 32.12s: compress begin: Blu-ray groups clips(00011.m2ts), playtime(7827820 ms), size(38577 MB)
30m 32.13s: processing source(00011.m2ts)
30m 32.15s: try to use gpu acceleration(1) for video decoding
I canceled it both times.

[LignGeorge]

I just found out that is only wrong readings from the incomplete file inside temp folder.The real bitrate is much higher.