My formation was changed after 2nd half

Hi eveyone,  while playing ultimate team I have an issue with my formation and tactics during the game. My formation was changed after 2nd half and even name of it was changed during the game. I never created such formation, i was playing my own when I stared the game, after winning 1st half 2:0, 2nd half my formation was changed and I started loosing and I paused the game and checked and I saw that formation was changed and players were in different postion and name of the formation was changed, I can assure it was created from someone and activated. How can I investigate that? And fix it? I lost every single game I dropped from 2nd to 4th and I realized after loosing 10 games straight. My formation didn’t work due to different formations was activated by someone. Plz help!!!