Suddenly, about 200 late answers showed up in the review queue, some more than a year old. Is this a bug or a feature?
I just got answer from Marius.This is a feature and not a bug.
He referred this meta question Why did the late answer queue spike on Sep 29, 2015? to see why it increased
It was expected to work a bit differently, though:
More details can see at Can we raise the bar for reputation for late answers to enter the review queue?