I'm level 40 and I keep getting battle matches with level 17-20 kingdoms. Is this a glitch? This has been happening for days now. Not only can I not find any crowns or coins, but it's also not fair on those other kingdoms as they don't stand a chance against my good army.

If we aren't getting matched with same level or same crown kingdoms, what is the matching criteria?
It's a huge flaw which ruins the game in my opinion.