When looking at the timelines of several different questions, I've noticed something strange: on some sites, timeline review events show the number of reviews of each type completed in that review task, and on other sites they don't.
It's probably better explained through screenshots. Sometimes it looks like this:
and sometimes it looks like this:
I recently passed the 500 reputation mark over on Arqade, and timeline review events now look like the second screenshot rather than the first, so it seems to be correlated with the Access Review Queues privilege.
What's the purpose behind this? Why don't timelines ever have pictures of waffles?