Your running the cron task right? I guess I would suggest you upload clean files if you have modified things. I show no open issues with ads not expiring if someone runs the sendnotice script
bulk options does not delete ads. If you go to approve ads and go to the expired que you can manually delete them but you might have an issue with your edits that are causing them not to be deleted.
Now in 2.6 I added in a silent operation to delete all expired ads over 2 weeks old