OK, I know what you mean. I just gave it a go on mine and yes, when I move the stick around in a circle around the extremities I can feel it at each corner.
That will be because internally the plate that restricts movement is like that. I have had mine for a long time and I had to try it to remember what you were talking about.
It is not noticed in flying. From flying ww2 through jets I haven't done any maneuvers that have shown it up so jump in a game and use it, if you can feel that you have probably done something to introduce a stall or a spin or something you don't want
I do use an extender so for me I really have to move it a long way to experience that but honestly, I never remember encountering it in any game without the extension.