Wont level up! So frustrating!

I liked playing this game so much up until i couldnt level up.. I got all the way to level 9 and realized that when I got back to the game, it had brought me back to level 6. I tried seeing if it was because I didnt quit or close the game properly but nothing, it just keeps sending me back to level 6. FIX THIS!!!

Csilvaaa about Papa's Freezeria To Go!, v1.0.0