log -g reports revisions in wrong order

One of our users encounters a strange order of log revisions. When
invoking an:

svn log -v -g <url-of-file>

the top-level revision r1605930 is reported before top-level revision
r2571860. In my understanding, this should not be possible. For a log
without merged revisions included, the order is fine. How can we
investigate that further?

CollabNet Subversion Edge 2.1.0 hosted on Linux
(RedHat Enterprise Linux WS 3, 32-bit).

CollabNet Subversion Client 1.7.2, 32-bit Windows
version, running on Windows 7 64-bit.

-Marc
Received on 2012-03-22 19:56:45 CET