This is my activity page on the mobile site:
A zoom in on the privilege tracker:
So it says that when I have more than 1,300 reputation, I'll get the privilege. Sounds correct, right? Let's just hop over to the privileges page and show how great it i—OH NO!!
The privilege tracker on mobile shows the wrong amount of reputation necessary to unlock "create tag synonyms" on Beta sites; it should say 1.25K, rather than 1.3K. Looking at other users' profiles, this problem also happens. This only happens with this privilege, as far as I've noticed.