7W/3L PlatIV to SilverV ? Is this Normal?

Hey guys. First of all I am not raging or smth like that. I am just curious. As far as I know Plat Elo players can only be placed Silver/Gold even if they lose all their games. I won 7 games and lost 3 games not great but meh. Shouldt I be placed in somewhere higher. I mean Silver 5 is the lowest so why did I bother winning games? Is there some kind of bug or is it like this for everyone?
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