however the OP cannot delete posts as long as the thread is in a section they disallows self moderation.
So it's the nearest explanation why the self moderation feature is disabled or disappeared when the thread move here in meta.
My problem is not here, topic is no longer self-moderation when I brought it back to reputation.
The self-moderated threads that are moved in meta will be disabled and even if you create a new thread in meta board then there's no self-moderated in additional settings. While it is now moved in meta then that means a self-moderated thread is no longer a self-moderated thread and once it is moved to another board like reputation then the thread will remain as it is. Only a thread will become a self-moderated thread after selecting the self-moderated in the additional settings before you post it. The only choice you have is to create a new on in reputation and lock the previous thread.