So why have Groups and Social vanished from the header bar - is it yet another site improvement 😂

@Nuno As it was occurring 3 weeks ago I don’t have a screenshot. It is an intermittent problem that at least at present has resolved itself. In simple terms the words Groups and Social vanish from the blue header bar and appear approximately a cm below it. I noticed it 3 times before asking the question and once subsequently. Whether it’s something to do with my using an iPad I wouldn’t know.