Missing IMAP Subfolders

I've recently encountered an issue with my IMAP folders on Dovecot 2.0.19. When I telnet into my account and perform a list, I get the following response:

A list "" "*"

• LIST (\Unmarked) "." "INBOX" A OK List completed.

However I know there are subfolders here and have examined the server directly via SSH and strangely:

a select INBOX.Clients

• OK [CLOSED] Previous mailbox closed.
• FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
• OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted.
• 0 EXISTS
• 0 RECENT
• OK [UIDVALIDITY 1394028715] UIDs valid
• OK [UIDNEXT 1] Predicted next UID
• OK [HIGHESTMODSEQ 1] Highest a OK [READ-WRITE] Select completed.

When I also subscribe to a couple if these which I am able to to do despite not being able to "LIST" them, I get this with LIST-EXTENDED:

a04 LIST (SUBSCRIBED RECURSIVEMATCH) "*" "*"

• LIST (\Subscribed \NonExistent) "." "INBOX" (CHILDINFO ("SUBSCRIBED"))
• LIST (\Subscribed \NonExistent) "." "INBOX.Clients" (CHILDINFO ("SUBSCRIBED"))
• LIST (\Subscribed \NonExistent) "." "INBOX.Clients.Bob" a04 OK List completed.

Just not sure why a LIST is not giving me a full list as it's causing problems subscribing to these with Mail Clients.

Any help is appreciated!