India Four Two

Jhieminga

The difference appears to be dependant on whether you are looking at a forum (with a list of topics), a single topic, or a topic consisting of multiple pages. For me, I can see the 'old style' one when I'm in a forum, the new one when I'm in a topic with multiple pages and none when I'm in a topic with only a single page, such as this one. That's on MacOS Mojave using Firefox.

MightyGem

Whatever I'm looking at, I get the "old style"
MacOS Sierra, Safari 12.0.1