Didn't play for a year, just did 4 ranked games and got iron

I came back to this game because I have some free time now, but something is really weird here, on S7 I was silver, then S8 didn't play, yesterday I played 4 ranked games and got iron (?) without even finishing the 10 games placements (it got changed)? Why is it like that? Also, I am playing against Silver 2~Gold V and op.gg tells I am unranked but I'm not! And I'm getting huge amounts of LP (60~70) Can someone explain please, thanks in advance.
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