git svn fetches the same revision multiple times for non-trunk branches

I am seeing git svn fetch repeatedly retrieve the same Subversion revisions when it finds branches in our Subversion repository. We are using the standard Subversion repository layout, with top level / trunk, /tags, and /branches directories (and the git repository was created with 'git svn init -s'). However, the problematic branches are often copies made from a subdirectory inside of trunk, instead of trunk.

The git svn fetch output typically looks like:

R2537 = d5b22e956157af036d4112e42e8fb927e45758c8 (trunk)
         M       Enterprise/VC/lib/SymbolVenue.cpp
r2538 = cfed4ca0491da0b732f32bfff72ba678450a0915 (trunk)
Found possible branch point: http://repo/prod_repos/trunk/Enterprise/ 
VC => http://repo/prod_repos/branches/file_conversion, 2523
W: Refspec glob conflict (ref: refs/remotes/scripter@832):
expected path: branches/scripter@832
     real path: trunk/Enterprise/Python
Continuing ahead with trunk/Enterprise/Python
W: Refspec glob conflict (ref: refs/remotes/trunk):
expected path: branches/trunk
     real path: trunk
Continuing ahead with trunk
Initializing parent: file_conversion@2523
         A       gc/QuoteService.cpp
         A       gc/TestSuite.h
         A       gc/quote_svc.pro
         A       gc/QuoteService.h
.....

r1 = d349ed8cb2d76596fe2b83224986275be4600fad (QuoteSvcFix442@2698)
         D       gc/FixMessageLogger.h
.....
r5 =
r19 =
r20 =
.....

And we are back at revision 1. git svn fetch then continues to fetch revisions until it reaches the revision that created the branch.

What am I doing wrong? Is there anyway for me to tell git svn fetch to not retrieve revisions it has already pulled? This is converting my import time from O(n) to O(n^2).

Robert