For no discernable reason, at any given time I could be presented with any of:
a review link, with badges indicating the size of the flag queue and the size of the review queue:
the same review link, but without a badge for the flag queue (even though it's certainly non-empty):
a tools link in place of the review one:
other variations on this theme that I can't recall/reproduce right now.
For the avoidance of doubt, all three of the above were taken within moments of eachother all whilst visiting the homepage.
What's going on? Bug? Surely this erratic behaviour is not by-design?