Uh, is that matchmaking normal?

Yes. Stuff like this tends to happen. I was a level 15 (on a level 2 account, since starting again is fun!) and was paired with other lvl 2s against level 30+

Let me answer your question: Yes, stuff like this happens all the time. It puts you in a random lobby with 7 other people, and then splits those 8 people into two random teams. It’s sucks if your a high level on a low level team.

The previous match my nephew had was about the same, but the other way around. He (a level 10) was paired with one lvl 1 and two lvl 2, and was against a team of a lvl 27, a lvl 24, a lvl 14 and another lvl 10, but I wasn't quick enough to grab a screenshot of this one. Was there a bug with the matchmaking server earlier today?

This is usual. Aside from that one player, the lower level team actually did fairly well. Level isn't really all that important.