Ctrl+B - Smoothing problem https://www.youtube.com/watch?v=6X9YjsR5wSA

As seen on the video, when demonstrating smoothing with Ctrl+B, notice that on the back (when dragging the mouse), the inner circle stays a perfect circle. 1:45 - 2:00 mins

When I do it, the inner circle turns in to an oval when I drag the mouse and as I drag it further the edges of the oval eventually overlap.


Does this sound familiar?

Here is the blend file:
I suspect that you have scaled the mesh in Object Mode and did not apply the scale before entering Edit Mode. To make the bevel operation work as you expect it to:


Press TAB to exit Edit Mode.
CTRL + A, select "Scale".
Press TAB to enter Edit Mode again.