Corrupted file on the website

Hello,
while, ehm, looking for release 4.2 easter eggs, I found that the file
http://www.openbsd.org/images/36song.gif
got modified since it appeared on the web site. I mean, it got corrupted.

$ cmp -l old/36song.gif new/36song.gif
116818 200 217
116819   0  17
116820  15  13
116821 101 116

MD5 (old/36song.gif) = 7213d4a6dbd962e4a6859fea98f341e0
MD5 (new/36song.gif) = 47ea62f69a3d1f9d01581fb28c8b9adf

Not that this single file is so vital, but are there any problems in the 
webserver or its storage?

Regards,
David