mike73 - 5:56 pm on Sep 12, 2013 (gmt 0)
Thanks for all the replies, guys. I did do a test with a fake User-Agent, and it still looked like they were cheating. I'll try testing from another server later tonight for further confirmation.
The reason I want to get to the bottom of this is that it makes me look bad when people click their links and the prices don't match. People think either my site is not reliable or maybe I'm getting paid off to send them traffic or whatever. Regardless, I like to do things right :)
Is there anything else I could be overlooking that could turn out to be an honest mistake?