5v5 Ranked Teams System BROKEN???

So today my friends and I decided to do 5v5 ranked teams and just get out of promos.

We won the first game after coming back, with a close score with a difference of maybe 5 kills or so.

The second game we lost, after going 11/2 in the first couple minutes but then throwing out of arrogance.

Third game lost due to our lanes losing

Fourth won due to good CC team comp

Fifth won due to good CC team comp as well.

As we entered post-game chat after the our 5th game (third won), we see "... placed in Bronze V."

WTF WTH HOW THE HELL RITO PLZ....

I don't know what's wrong but theres no way. We have 2 Silver 5's, a Bronze 1, and 2 Bronze 3's.

While I understand there are some bronzes, there is NO WAY that we should get bronze FIVE. At least high bronze, low silver. Is this a bug or a flaw in the system?