Merge produces 6(!) conflict files for one file

For the attached repository dump (received from one of our users), when
checking out trunk:

   svn co svn://localhost/trunk trunk

And then merging:

   svn merge svn://localhost/branches/dir/merge.txt trunk/merge.txt

Subversion 1.5.0 reports:

   --- Merging r3 through r4 into 'trunk\merge.txt':
   C trunk\merge.txt
   --- Merging r5 through r9 into 'trunk\merge.txt':
   CG trunk\merge.txt

And results in 6 conflict files:

   merge.txt.2.working
   merge.txt.merge-left.r2
   merge.txt.merge-left.r4
   merge.txt.merge-right.r4
   merge.txt.merge-right.r9
   merge.txt.working

In case that this is no bug, can someone please explain how to
interpret/handle this result?

--
Thanks in advance,
Marc Strapetz
_____________
syntevo GmbH
www.syntevo.com

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