Are you using a router or proxy to get into a NAT space? It might be that the votes are fine, just that you are seeing everything coming through a redirecting IP address...

I have a Linux machine acting as a firewall, which is doing NAT, as well as port forwarding for HTTP. However, the IP address in question isn't one of mine -- according to host/nslookup, the address is in a block reserved for NCR Corporation. My ISP is a customer of NCR, but if there's any redirection through them, it's nothing I can control.

I've had a few more hits from that address, and if it's not some random process, then someone's got an out-of-date cache -- all my current pages call the CGI script with a parameter, but there weren't any parameters given in the access from this particular address.