cyrus not able to delete files after migration

[Ramprasad]

I have cyrus 2.3.7-4 on Centos 4.4 ( reiserfs partitions).

 We recently migrated the data and everything apparently is working
fine. We simply rsynced /var/spool/imap and /var/lib/imap from the old
cyrus box 

But what we have realized is when a user deletes the mail and expunges
the mail is not seen in the mailbox ( imap or pop ) and the quota file
is also updated properly. But the physical file is not deleted 

When I reconstruct the mailbox all expunged mail-files are deleted but
newer files are still stick on even after expunge until next
reconstruct 

What may be causing the issue. How can I debug ??
( We have around 22000 mailboxes with around 20GB of mails per day ) 


Thanks
Ram