Is a bit of El Capitan in Sierra?

When I got a message on Corruption and saw that my OS was called El Capitan, even though I have Sierra, I thought this must be a symptom of what was wrong. But it seems to have got rid of the Corruption and the operating system is still called El Capitan AND I still Sierra. What is going on?

You see this behavior in 'about this Mac'?

Tags: Mac OS & System Software

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