I’m not sure what you mean with that.
You mentioned using their code and that they would put adverts in there.
Which means, the actual banner is not controlled by AdRotate. AdRotate just places the affiliate code there regularly.
AdRotate’s output is random, you should not expect a fixed cycle of adverts. Even more so since the affiliate code is randomised, too.
It may happen that you see the same advert a few times. Or not for a few page views. It’s randomised.