So I hit Diamond...

So hit diamond last night (yay!), and I solo queued into this game from 2980. The game was a 3485 vs 3495 game. There were people at 3700 and on my team, and yet masters are not aloud to queue with people 500 Sr away. Any idea what happened here? I won but I was shocked and a bit more nervous about playing right that I decided to just heal. I have a pic but I'm not aloud to post pics here through the app.