git-svn and huge data and modifying the git-svn-HEAD branch directly

hi everyone,

as i mentioned, i do experimental work with git and svn... and i
experienced some problems with git when pulling much data from svn.

Actually that happens after i commit a revision with many and big files.
After that i cannot do a git-svn fetch anymore because git-svn
complains...

fatal: Ref refs/heads/svn-git-HEAD is at
504721bf4b2702d3e56cef69950f42a43568e846 but expected
504721bf4b2702d3e56cef69950f42a43568e846

now i am a little confused about that... oh, i actually modified the
svn-git directly instead of a private working branch... perhaps that was
not intended.

now i am still on rev 2 on this branch but i updated it to rev 5 on the
svn-side...

any hints?

Sincerly
Nicolas