I believe there's a bit of caching going on. On my 7.0 it does the same thing, and updates once a reply is made to the post -- as long as someone doesn't reply to a reply with the old subject. Is that the case?
GangsterBB.NET (Ver. 7.6.1.1) PHP Version 5.6.40 / MySQL 5.7.23-23 (was 5.6.41-84.1) / Apache 2.4.54 2007 Content Rulez Contest - Hon Mention UBB.classic 6.7.2 - RIP
