Language doesn’t switch

Hi guys,
My wordpress doesn’t change language from general options page. I can select a language do set, but after press save buttom, this back to english… but pannel looks like in portuguese.
Soo, maybe someone will ask: and whats the problem? In your panel showing your desired language…
But no. I use woocommerce and in their status is language en_US, soo woocomerce working in english, but my wordpress working in portuguese.
Most weird is in database show language in pt_BR.

And i tryed to reinstall… works at beginning, but after import pages and products, happen again.

The page I need help with: [log in to see the link]