Bug

I WAS PLAYING THE SURVIVAL MODE IN PLANTS VS. ZOMBIES WHEN, SUDDENLY, I COULDN'T CLICK ON THE PLANTS—I WASN'T ABLE TO PLANT THEM. I CLOSED THE GAME, BUT WHEN I OPENED IT AGAIN, IT HAD RESET ALL THE WAY BACK TO THE VERY BEGINNING—ADVENTUREN 1, LEVEL 1. PLEASE HELP ME, WHAT SHOULD I DO??? PLEASEEEEEE!!