Hi @ShawnOfTheDead207 ,
I believe, that Duplicating the Circle in Edit Mode was not wrong in this case.
If some Vertices move along unexpectedly, double-check that they were not accidentally Selected. Also make sure that Proportional Editing is not enabled! (The shortcut key for that is O and is easy to hit by accident (instead of 0, for instance). You can also have turned it on deliberately and just forgot to turn it off again.)
