Hi Daniel, with that world it is coded to checkpoint your progress after you clear levels 4-6 and move onto this screen.
sorry about the inconsistency and confusion with this! Thank you so much for playing
Yeah, same problem here. I solved 7, and then pushed sheep 7 into one of the black dots, and then went into 8 and then 9; now, "reset" takes me to the point before I went into 8, i.e. with sheep 7 and the leftmost black dot already missing.