There seems to be a bug on some sites right now. Here, for instance, the "month" tab (
/users?tab=Reputation&filter=month) says that it's the score from 2016-08-01 but some users show their rep from the start of July onward.
It's not like that for everyone. For example, my own month's reputation shows (as it always has before) the figures for August only -- as it does for many other people.
Here's figures for CrossValidated (stats.SE); whuber (circled) and I earn fairly similar reputation amounts week to week. He and I have almost the same quarterly reputation, but his monthly is showing his reputation since the start of July, while mine shows only a few days of reputation.
Is this a bug? Or some temporary issue?