Everything is said in the title.
Steps to reproduce:
Log into the system and see the number of notice (3 in my case).
I acknowledge them and wait for more than one minute (which is set in ZK_DASHBOARD_REFRESH_INTERVAL).
If i click on the link, it opens the "Notice" window with no records, but the label inside the panel is still showing 3. It I logout/login, the number is updated to 0.