I think that the topics are still in the announcement table (from when your mod announced them), when I try to sticky one of the topics on the top it greets me with:
We encountered a problem. The reason reported was
Script: /home/user/public_html/forum/scripts/stickpost.inc.php
Line#: 108
SQL Error: Duplicate entry '28911-5' for key 1
SQL Error #: 1062
Query: INSERT INTO ubbt_ANNOUNCEMENTS VALUES ( 28911 , 5 )