Did something break?
This morning there were about 2, now there seem to be 1200 Late Answers.
This appears to be intentional. As of 1700 UTC October 8, the backlog queue has been reviewed. The site-wide change is being discussed in this answer/question:
I'd like to try raising the reputation for getting enqueued to the Late Answer reviews to 50 and reconsider upping it to 100 at some point in the future
If there's a big problem with this change, asking on MSE directly or here would be ideal.
Personally, I'm seeing a majority of answers that deserve up votes. A few answers that are spam/terrible, but the real benefit I'm seeing is giving attention to the questions themselves. Most of the bad answers are due to a bad question, so I'm cleaning them up when I find a bad late answer as well.
When the OP doesn't accept an answer, it encourages late answers, so I'll encourage everyone that reviews to take their time on this large queue and really give each post some attention before moving to the next review.