Sfz using - error or not?

Hi!
I use sfz for emulating bells. I attach one wav-file to one note. It looks very simple.
But sometimes it works, sometimes not and I'm totally confused to understand - why. Can anybody help me, please?
Here is ziped example - https://drive.google.com/open?id=0Byblwl1einqsS1Npel9PTDVpSkU
There are two similar scores: DBells-5(sfz).mscz and 3-7(sfz).mscz. DBells-5 uses 000_DBells-5_main.sfz and 3-7(sfz) uses 000_3-7.sfz. In DBells-5 notes A-35, B-35 and D-38 - play, but F-29 and f-41 play not. The sfz is very simple:

lokey=23 hikey=89
loop_mode=loop_continuous
ampeg_release=10

sample=samples\2007_02_LH_03_-0_5d.wav
volume=10
lokey=29 hikey=29
pitch_keycenter=29
offset=1000
end=659505
... and so on...

For test I have built 000_3-7.sfz for 3-7(sfz).mscz with 3,4,5,6,7-voice sounds and it play all notes. The sfz is very same:

lokey=23 hikey=89
loop_mode=loop_continuous
ampeg_release=10

sample=samples\3.wav
volume=10
lokey=29 hikey=29
pitch_keycenter=29
offset=0
end=43155
... and so one ...

I can't understand why 3.wav plays but 2007_02_LH_03_-0_5d.wav doesn't.
Can you help?