Curious as to how muting someone works

I have one person muted. Have not seen a post for a month.
Then a post shows on my feed, when I check the mute status, I am informed that this person is already muted.
Why would I see a muted persons post?
Still using the same name.

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Convivial · 26-30, F

I always thought it was like a black hole you banished someone too🤔

Gusman · 61-69, M

@Convivial Effectively it is, supposedly.
Muting someone means their posts are no longer seen by the muter.
It worked for 2 months?
Then I saw that members post. Plus I can see later posts. 🤷‍♂️