Oh, some of the results are too large to fit into one message, so it splits it into two, and sends both simultaniously. I'm having problems with a IRC server booting me for spam, so it would be nice to fit long messages into one single message, with a link at the end to expand it if need be.
Example for the link:
: !wa 2+2 | 2+2 | 4 | four | * * * * | http://www.wolframalpha.com/input/?i=2%2B2