Why does the game out of nowhere gives me impossible matchups to beat in arena?

JMilly

I'm on a 28 win streak but they would give me a similar team rating to mine, even though it was on hard mode i was still able to beat it but on the 29th match, this happens.

Can someone please explain why this is?

Shiroihara

That will happen if you try teams with too low a rating.
Maybe someone can give you an approximate rating but I’d stick to rank 3s in that arena.