I asked a question that was a bit hard to explain , so I had to edit it with every comment on it.
I noticed that in one of my edits (edit #13), I have somehow reverted all of the previous edits. If you have ever edited at Wikipedia ,I mean something like editing an old version of an article happened.(I added something but deleted all changes added after some version of the question). You can see this in the revision history of the question.(edit number 13, and I modified it in edit number 14 using provided source of each version).
But I didn't remove anything from the question in that edit (#13), just added a single sentence at the end of it.
I wonder how can it have happened; and also, is there any straightforward way to revert an edit?