Message that I have to upgrade my account

Hi I am receiving this message:

"Congratulations, your team is growing! It's time to upgrade. Committers will have read-only access."

But I do not know why. I have only one shared repositorie https://bitbucket.org/ruanltbg/lowlovers and only this two users can access:

• Me (ruanltbg)
• robarp

At this time the user robarp can`t do anything in this repo.

Thanks.