Why is one rectangle being the same fixed point and not being rounded?

enter image description here enter image description here

  • 1
    $\begingroup$ Subdivision 6 is really too much. Stay under 4 if possible (3 should be enough) $\endgroup$
    – Sanbaldo
    Commented Apr 16, 2020 at 7:00
  • 2
    $\begingroup$ Remove doubles if you already didn't. $\endgroup$ Commented Apr 16, 2020 at 7:35

1 Answer 1


The problem could be that you have duplicated vertices.

Try to select the overlapping vertices in your red circle (the one you draw in the screenshot) and merge them Alt+M in Edit Mode. Do it for all the 4 areas that generate the rectangle.


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