SpamAssassin can't add?

[Hirsh, Joshua]

 This is a bit weird. One of my users emailed me about a message that was
incorrectly marked as SPAM. I took a look and noticed that SpamAssassin had
assigned the score as follows:

 SpamAssassin (score=5.2, required 5, AWL 0.00, NO_REAL_NAME 1.15,
OPPORTUNITY 0.68)

 Now, unless this is some bizarre form of math I've never seen before,
something just doesn't seem right ;-)

 Anyone seen this before? The server is MS 4.23-11 with SA 2.55.



 Cheers,

-Joshua