After Maitence...umm wth riot?

Completed 41 games of this preseason Flex stuff, ended up bronze 3 after finishing gold 5 last season. After 41 games i worked up to silver 5 promos before the "maintenance", where I had to come back online and play another game to determine my "fixed" rank. Well after winning that game as I had done 70 percent of the time during flex, it put me BACK in bronze 3.. thanks riot. wasted 20 hour weekend..