Question about starting survivors level

Hi there, my radio tent is at max level and It says that starting level survivor is from 1 to 14. In fact, all my survivors comes between level (about) 7 / 14 wich is fine because that is what is expected.
Now I see in pictures of other players survivors some uncommon at level 17.

How is this possible ?
Their radio tent cant be at higher level than mine, but yet they get survivors ready at level 17

Please explain ???


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