The only thing was removing a "Thanks a lot!" text. When I check the revision history, previous revision (#2) looks like a proper one while revision #3 only removes a simple text, and when you check the question, last edit was seen as revision #3 edited by the owner of that revision.
That looks like an ugly act (may be a vandalism for the revision #2)! I tried to remove the revision but since removing is not allowed, I made 2 rollbacks for the edit history.
So, I guess there must be a way to report unnecessary edits made by high reputed users (whose edits do not need approval)
Or am I far too frustrated about that kind of unnecessary edits?