My previous plug was wobbly, which is why I had to replace it. In my opinion, the plug (both the father and the mother) are all made in China - that is, despite standardisation, not of particularly good quality and precision. But it worked for me, for others it wobbles and others don't plug it in all the way. Well, it's just not Swiss precision...

In my case, the plug wobbles so much that it does not make a clean contact and does not work.