Security code notification changes from people I don't know!?

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1
Registration date
Monday November 8, 2021
Status
Member
Last seen
November 8, 2021
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I had 4x contact security code notifications from people in Whatsapp Web from people I don't know, I have not blocked and are not in my address book.

The four contacts I don't know appear all at the same time at 11:59am.
By 12.10pm the notifications and new chats informing me had disappeared from my chat list?!

I was using Whatapp for Web from an Opera browser.

What do you think happened here?