I just got a reply from support, it is a problem with 1 of their servers and they are working on it.Here is the email :
Thanks for contacting us regarding this matter, and I'm sorry to hear about your trouble with this. We have received similar kind of issue from other customers as well. The listings are moving into the scheduled page instead of posting directly. This appears to be related to an issue with one of our servers. Our Engineering Department is currently working to resolve this issue as quickly as possible.
In the mean time, I would suggest you to try canceling the duplicate listing from the scheduled listing page and not to try posting the listing again until the issue get resolved.
We apologize for the inconvenience and we appreciate your patience with regard to this matter.