Yep, I get the same thing I tested a couple of banners (from other sites, not mine as I don't have them up).. the banners do go to the right place. Whether tracking is working or not - hard to tell.
I'll email these folks and let them know what is up.
Seems like the problem is occurring across the rival platform we have logged the error with the relevant parties and are awaiting their response. Many thanks in advance for your patience and understanding.