What happened!?

You tried going to https://babymetal.me/category/%25E3%2583%25A1%25E3%2583%25B3%25E3%2583%2590%25E3%2583%25BC%25E7%25A5%259E%25E3%2583%2590%25E3%2583%25B3%25E3%2583%2589/page/2, which doesn't exist. You can try navigate or search.