As you can see, 13 edits since August have been erroneously attributed to 127.0.0.1 in the AbuseFilter log. The diffs all seem to list the correct usernames, e.g.  and , and localhost contribs doesn't show anything since a bug that was resolved back in June. None of these edits was blocked by the filter, so they all show up in the relevant contrib page, e.g. .
An infrequent issue in itself, but I'm setting it as major due to the possibility of larger underlying bugs. Downgrade if you disagree.
Oh, and CC'ing wikidata-bugs in case this turns out to be a Wikidata thing.