According to the achievements tab as of right now I have gained 20 points and lost 2, yet my reputation on physics stackexchange shows as 19 and here it shows as 21.

Is this a glitch?

EDIT: after I posted this my reputation here now shows as 19.

EDIT2: In retrospect I should have asked two questions: the first one about the inconsistency between sites which has been answered, and another one about the minor inconsistency between what I see and what the site shows (19 shown, but adds up to 18), which still appears to be a bug.

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    $\begingroup$ Wait a while Things are cached and update on different schedules... $\endgroup$ – dmckee --- ex-moderator kitten May 12 '18 at 2:31
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    $\begingroup$ Reputation is one-based, not zero-based. You start off with one rep. point. Add 20 and subtract 2, and you end up with 19. $\endgroup$ – AccidentalFourierTransform May 12 '18 at 23:36