There was some very unusual rollback activity today on a question I edited, where out of nowhere a user who wasn't involved in the conversation, answers, etc came in and rolled back a couple different times and introduced some completely extraneous tags to the item, while at the same time completely undoing a lot of IMHO useful formatting for readability fixes I had made. So I'm curious at others thoughts about this. I tried to do the right thing here by asking folks on chat what to do and not getting into an edit war and posting here :-) per another meta post I recently read.
Being intrigued I took a look at his activity, and found additional "odd" behavior on his last actual activity period, where he undid an OP's edit of the OP's own post. The OP in that case was Ed Healy (21K+ rep), and this guy has 3kish. Eventually another mod came by to fix it; but this just doesn't feel right.
While not definitive or restrictive I also noticed the user in question doesn't have a single tag for any of the topics involved in the case of mine he edited today. Which combined with everything else struck me (and several people on chat jaif, sehe ) as extremely odd.
Everything else in the user's history looks normal though aside from a huge decrease in activity which is just coincidental and could be for any number of reasons.