cubes not rotating around the center

Unity Engine
1

Good evening to all,

I’m trying to rotate several blue cubes (joined together) around the center, and I’m doing the same with a plane and another single cube (white).
The 5 cubes are related to a parent cube (Pent Cube) and the latter is connected to a rigidbody.

The problem comes when I want to rotate the blue cubes.
I click on the left capsule (to rotate the plane, the white cube and the 5 blue cubes).
The problem is that the blue cubes seem to be attracted by the left capsule which says to turn 90°, here is the code:

 void OnMouseDown()
    {
        plane.transform.RotateAround(Vector3.zero, Vector3.up, 90f);
        whiteCube.transform.RotateAround(Vector3.zero, Vector3.up, 90f);
        pentCube.transform.RotateAround(Vector3.zero, Vector3.up, 90f);

Normally the blue cubes should rotate 90f inside the plane (and not on the capsule), like the white cube does.

And here is a video to better understand:

Thank you all for your help.

A+

2

First thing to check is: grab those five cubes and rotate them with controls in the editor.

Until they rotate perfectly around this magical thing you call “the center,” nothing else matters.

3
4

Good morning,

my problem is that the blue cubes are pointing to the left capsule
(instead of rotating around the center of the plane).

Thanks for your help.