Serious question.

So I didn't log in for a couple months and I get on to do my gold series. I lost, which is fine but then I saw this:

My team is gold 5, gold 4, gold 5, silver 1 Their team is plat 5, gold 2, gold 2, gold 1

I now remember why I quit league. When I am support and I deal more damage than my mid and ADC, even though i'm building full support items. Then check after game and the enemy team is a FULL tier+ than me.

How does it even exist?