Riot, where is the fix for the placement issue?

Was Plat 2 last season and just won 6 games out of the 10 placement games. Just got placed in Gold 5 and was able to "climb" up to Gold 3. Now, after the "placement fix", I lost the replacement game and got placed into Silver 1. A friend of mine was Diamond 5 last season. Now he won 1 game out of the placement games, because he trolled to get placed really low. But what happened? He got placed into Platinum 3. I don't get it. Can anyone explain me the "fix"?
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