I lost all my progress in ufc.

Why did i lost my progress in ufc. I was logged as guest. I did not erase the game so that is not an issue. I played the game, i took a 10 minute break and when i started the game again all my progress was lost. I had about 30 fighters some of them at level 50+, i was in stage 6 în head to head mode! I want my progress back or the time i spent playing the game!