I joined a site in private beta and posted an answer citing one source. One user made some edits which I did not agree with, so, I rolled back the changes. Some of the proposed changes were grammatical in nature while others converted a definitive statement I made to an ambiguous one which I didn't like at all.
Then I notified the user in comments why I rolled back the changes. The person did not agree & downvoted my answer. Fair enough. I didn't mind.
Then User-2 tried to re-apply User-1's changes which I rolled back again. User-2 tries to argue in comments why I should allow the edit, I then explained why didn't like the suggested edits because my sources say otherwise and changing it the way they wanted conflicts with my sources.
A moderator appears out of the blue and has permanently locked my answer after rolling it back to User-1's edit.
Is such an action by a moderator justified? What is the official policy on when should a moderator get involved in an edit war?
What authority or role does OP have when his or her post is messed around by other users which includes a moderator, conflicting with OP's intent?