I presume that someone checked this in by accident, but it was quite a surprise.
Be prepared for anything when in DEVELOP mode
"svn log" will give you an easy overview of why a file was updated, i.e.
svn log -r 8000:HEAD data/Main/TWikiUsers.txt
will report something like this:
r9179 | SteffenPoulsen | 2006-03-10 21:01:05 +0100 (Fri, 10 Mar 2006) | 1 line
Item1126: TestUser is one too many
Reading a few SVN docs will help you get the most out of SVN and at the same time prevent too much static here.