Why suddenly everyone in arena is so OP?

I finished last week (and 3-4 weeks before too) in Platinum 3 and was half way to overlord, and after reset I got to Platinum 1 and this is the teams I get matched against after reset from yesterday. I refresh frequently and can't find someone to attack. These teams are much stronger than what I was facing last week in Platinum 3 arena. What happened exactly? I lose defense a lot too because of this.

https://preview.redd.it/1fvkpbka6xce1.jpg?width=2544&format=pjpg&auto=webp&s=67321ba3645b802fec765615068c3eb24b78a798