SecretLeeds - History, culture and architecture in Leeds

I have not made much use of the PM service on this site. There is one aspect I find confusing. When I have composed and submitted a new PM it appears to be stuck in the Outbox rather than the sent messages folder. Is that how it is supposed to work?
John

Rest assured BP it does get delivered, I'm on three other sites that use this forum software and they all do the same thing.
IE PM in outbox for a short while then PM delivered.

Thanks TC