First of all, my apologies if it looks like a duple of Notification for reviews shows way too many, but since this question dates from more than 2 years, I thought it could be worth mentioning here.
I have this number "1" since last week:
And when I click on it, I go to this page:
First I thought it will disapear by itself, but since it still there, I thought it is probably a bug that I might report.
EDIT: The answer of the Notification for reviews shows way too many question says:
This indicator is shown only to moderators and users who've gained access to the moderator tools.
As I didn't reach the requested 2k rep points, I did not have access to the moderator tools.