I have a humanoid robot which is something like a modified version of robotis op3. When I change its rotation, the robot surprisingly happens to face ridiculous problems. For example, its joints start to take apart or merge into each other. Does anyone has any idea about this?
As said in the comments of the issue, this was due to non-normalized rotation values not handled correctly be Webots.
This was fixed in Webots in https://github.com/cyberbotics/webots/pull/1459.