The Proofreader badge's description reads
Approved or rejected 100 suggested edits.
Right now, 9 users meet that condition, however, only 7 users actually earned the badge (i.e., brasofilo and I did not).
Even if posts users wrote themself aren't considered (which may be the case for myself, because I remember approving/rejecting suggested edits of two or three of my own posts), I can't believe brasofilo did that more than 38 times (referring to his 138 suggested edits).
What am I not getting here?