Thanks so much for the help everybody!
OK, I think maybe we got it figured out… We’re using server redirects and he said that’s the issue. here’s what he sent me:
“Basically the problem arises when you send someone to the WP site and then try to redirect from there. It is that double redirect basically. It is actually fairly unique to only those using an affiliate system (of which WP is really a blog platform not a content management system).”
Any thoughts?