Text in pages translated to another language by it self

This is so strange. I have a wordpress installation on https://www.distanskursen.se. Im from Sweden so all my texts are in swedish. But now suddenly some of my pages are in english, for example https://distanskursen.se/?page_id=60. It just happened over night. I cant understand it. These texts are also in english when i log in to admin, and check the HTML-code, ant the problem is the same in different browsers and different computers. Im using the theme WP remix, but never had this problem before. Im going crazy!