We have detected an issue affecting exclusively push campaigns including a Mobile Landing. We have rolled back the maintenance update that was causing the issue since 12h00 GMT. The issue has been fixed. Some of the campaigns impacted by the issue have been resent manually. The issue was still impacting push campaigns containing a Mobile Landing. This only happened when the wording of the Mobile Landing was exactly the same for two different languages. We have just released a fix for that specific issue.