Hey, what´s up?

I don't know if anyone else has had this problem, but I've had it twice!

I'm playing shadow legends on my pc (Windows 10, no bluestacks). I left the game open and went out to lunch, when I returned, my sacred fragment no longer appeared in the portal and I found a new champion in my box of champions. I live alone, so there's no external problem. I was saving that sacred one for double events, but they opened up to him.

Could this be a bug or something?

Thank you!!