When I look at my network profile, I can see that my rep counts have already been recalculated after the question upvote value was increased. I now have about 350-450 extra rep on the five sites I most frequent (plus Skeptics, which is kind of an outlier for me).
But when I open the hamburger menu in the top-right, the "Your Communities" list still shows the old rep count for SciFi. Bizarrely, it shows the new rep counts for the other sites, and if I actually go on SciFi, it shows my new rep count in the top bar:
When I first started typing this question, "Your Communities" was showing the wrong value for Puzzling as well, but by the time I took the second screenshot it had fixed itself. I'm sure the value for SciFi will correct itself shortly as well, but what I want to know is, why was it wrong in the first place? Are the totals not updated in real-time? And if not, how come some were correct and others weren't?
It wasn't my browser cache, because I cleared that repeatedly and it was still happening.