Yo I just skipped from D4 to D2 wtf?

Not here to brag but I just skipped from D4 (D5) to D2 (D3) when I have trash winrate? How is this possible? A few of my other stuck D5 friends hit D2 aswell?

My OP.GG: http://euw.op.gg/summoner/userName=buff%20graves

(it hasn't updated yet)

here is before and after: https://gyazo.com/b09a15cce58db5ebf445a612f832dc69

https://gyazo.com/1b20f56889b95c3ca4ca9d173a0d4b47

Also, I finished D5 last season but I have D1 border for some reason.