This sounds strange, never had or heard about this before.
Can you give us some more info? Are the tickets assigned to staff members? Are you looking at the tickets as an admin?
Are you using RC3?
Yes, I'm usign RC3 and I'm looking at staff panel as an admin.
Tickets fetched from POP3 aren't assigned to staff member, and even if I assign one ticket to me I can't see in the "assigned to me" list.
Only with advanced search.