player stats and achievements are deleted

1 bug:i was playing in my world and i was bored so i tryed to tp as high as i could.i typed /tp notis 100 9999999999999999 100 i got kicked for illegal stance and i can't login my world now.

2 bug:at 1.7.9 everytime i close my pc when i open it and try to play a world my player stats and achievements are deleted.