Gold 1 To silver 3

I'm plat 5, does the flex que provisionals, wins 8 loses two, gets gold 1. Then they decide to reset the ranks and I play one get an afk blitz lose and get silver 3. Like how does that work, I went down more than a rank! That was my first game I went negative in too..

And I'm also curious, how my friend in silver wins 8 games loses 2 and gets placed silver 4.

Gold 1 https://gyazo.com/4aae6526fa49d16b828ab7657af8bd56 Silver 3 https://gyazo.com/9f6651f0c57a1ec201b09ad3cc3ae05e