For some reason, some of our servers have decided that our subscription has expired. They are all registered to the same SMT server. I followed the instructions here:

to make sure our SMT server is active under the correct activation code. Afterwards, I started re-registering our servers back to SMT to make sure they all had the current active registration. For some reason though, some still say they are expired. What do I need to do to clear out the old registrations on them and get them active again? I thought that once SMT was registered correctly that they all got their activation from it? Why would some get the new code and some not? Is there a way to see what code they are getting?