I had a message on my GAN interface for an Out of Date Link. When I look at the message, it tells the Tracking, Referral, and Creative URL.

In looking at the URL's, the "pubid" is my GAN affiliate ID. Here is what seems a little unusual. The "pubid" on the Tracking URL is my GAN ID and the "pubid" on the Creative URL belongs to someone else.

Not a big deal, but I do wonder how this happens.