Yeah, i would say random fluke too. i'll keep an eye on it, but the work around is simple enough and easier than to try an troubleshoot whatever combinations of code there is on the page that's probably contributing to it.
Overall, this part of Security Assist is one of my favorite tools to use - it really adds an element of professionalism to a site especially with the various options there are, such as using groups and being able to apply rules to multiple pages for larger sites.