Thanks for for the heads-up. I actually fixed this the day you posted, I just didn't post a reply here.
For anyone interested in technical stuff: It wasn't really missing, it's just that vBulletin was set to combine announcements. So when I added the announcement about the T-shirt design contest that was the only announcement title displayed since it was the newest. If you clicked that announcement in that Vendor forum you'd actually see both. But that is very confusing so I changed the setting so the software shows announcements separately.