Hello Tao,
A smaller example of your problem is this:
%% ------------- LilyPond code -------------
\version "2.11.23"
\paper{ ragged-right=##t }
\relative c'' {
c c c c( |
<<
{ c) c c c( }
\\
{ g g g g }
>>
c c) c c |
}
%% -------------- end of code --------------
The << \upper \\ \lower >> code creates two new voices,
and both \upper and \lower are different from the main voice.
Each voice has its own slurs.
This is the problem. Unfortunately I don't know the solution,
but maybe someone smarter will help you.
Zoltán
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