Why do I sometimes see a count (usually 5-7) of suggested edits on my SO toolbar and sometimes nothing shows?
When you see this, it means that there are some items that might be your choice to review! It is also a notification for you, telling you that 5 - 7 items are available, if you're free, you can go and review them and take action as necessary.
When it doesn't show there, it doesn't mean reviewing process is over, it might mean that you're busy and the system avoided showing you with the items. Why I am saying this, is because I open the page and I get the same 5 - 7 items to be reviewed in Orange color notification, but once I reload the page, its gone! No one can review them in a second but since I was showing minimum attention to that, system ignored me from reviews!
So it is OK to see them and not see them! Try to go and edit and review the post that are active rather than just going in the queue process.