Unfortunately, I have no way of investigating exactly why they flagged this site, but they had no reason to do so. The only thing I can think of is that some of our users have had viruses in the past that hijacked their DNS queries and pointed this site to a malicious server. And since McAfee is retarded, it wouldn't surprise me if they flagged it when it wasn't even pointing to the right server.
I appreciate you bringing it to my attention, and I'm going to investigate this further. In the meantime, if you have some way of flagging it as a misreported URL, I'd appreciate you doing so.