I was looking on SO and saw this question:

IMO, the question does not meet the basic requirements. I would at least include the HTML as well. Also this question has a beginners vibe.

But after further investigation I found answers formulated in an other style and have a sort of senior level (even on answers from more then 10 years ago)!

I have a strong feeling there is another person on the account. This could be:

• Plain wrong, and my suspicions are completely incorrect.
• Correct, because of an oversight (was logged in on someone else computer)
• Correct, because this person has sold his account to a new programmer.

What I could find is that selling your account is a little bit frowned upon to do this: Selling Stack Overflow accounts

But my main question is, should you do anything if you suspect something?

I noticed a user post a question that looked rather basic. I looked at their previous answers formulated in an other style and have a sort of senior level (even on answers from more then 10 years ago)!

I have a strong feeling there is another person on the account. This could be:

• Plain wrong, and my suspicions are completely incorrect.
• Correct, because of an oversight (was logged in on someone else computer)
• Correct, because this person has sold his account to a new programmer.

What I could find is that selling your account is a little bit frowned upon to do this: Selling Stack Overflow accounts

But my main question is, should you do anything if you suspect something?