IE 11 border-radius weirdness (did not occur in IE 9 and IE 10)

Question

I have searched for similar questions related to border-radius in IE 11, but only one found on the Microsoft IE Developer site described what I am also currently experiencin

Answer 1

As far as I know there's a bug with border-radius in IE11. The issue you describe may be part of the bigger picture. More info.