Yeah- it happened when you went from lvl9 to 10 if i remember correctly.  
Now after update those levels have changed a little bit so i guess transition to different player pool happens from 11 to 12.

It usually happens whenyou invrease garage level. When you you increase your garage level another event will appear to match you with other players of same skill i think.

So I wasn’t competing against everyone?

I don’t want to get banned for illegal rewards

Is this intentional? Can someone help me with what is going on here?