Hi mvhs,
It’s actually not a bug. Each time you pull a campaign/banner link it is encrypted and synced with our multiple databases, this can take upwards of 5 minutes. After that the link is live forever.
As for your clicks not tracking on different banners, remember our system only counts unique visits.
I hope that helps, if you have any further questions, please email/call/IM your affiliate manager, or PM me.
Good luck,
Joe