Also noticed this in mail manager.
The items circled in red have problems. If you change show the number of entries per page from the initial 20 entries per page to some other number lets say 100 per page, the page counter will still display page 1 of 18 or whatever the initial count was.
The second issue is under entries per page, they go from all messages, 20, 50, 100 messages per page and then keep repeating 100. I am assuming they are going 200,400 or something to that effect because changing that field does change the total events displayed.
Entries per page field has wrong entries in all manager reports; smtp quarantine, smtp spool, smtp log, pop3 quarantine. I don't have that many mails quarantined or spooled to check if the page counter is wrong on all reports also.