OSx : User appear in /Users but not in Preferences/Users And Groups

SO i have those users in /Users cd /Users

But in Preferences -> Users and groups this users doesn't show up.

When i open the command line the the prompt looks like it's shown in the screen shot.

So i have two users name that show in the prompt, and i find that weird.And i jus want to knos how is that possible, is it safe to delete the "macbookpro" ? I don't think so but i am not sure. I think all the content of my mac Documents, Photos bleong that user "macboocpro".

cd ~ | pwd gives this : cd ~ | pwd

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