What are you trying to delete?
I would say it's probably because of this:
I think how I'd prefer to handle it is to prevent deleting posts within 24 hours of posting them, in the problematic sections only. Which sections are problematic?
OK, the 24-hour limit is now in place in the sections that people mentioned.
Are you trying to delete a post on the Altcoin Board in the first 24 hours you posted it? Or are you trying to delete your thread? In this case, it isn't possible anyway.