I checked the suggested edit history and this seems to be an isolated problem. It is only one post on the site which has had these problems, and it happens to be yours. There does not seem to be a software bug anywhere, just a single person trying to game the system. "Anonymous user" just means that somebody who does not have an account on Seasoned advice suggested the edit, this is made possible by design.
I will try to find a good solution with the team, but I think that there is already some system in place which will block suggested edits from an IP address if there are too many rejects in a short time. Probably 3 times in a week is too low to reach the threshold.
If I learn something more, I will add to this answer.