2 goals in 4 games (should have been 3 in 4 if a Chelsea player had not used an arm to scoop one out on the goal line) at the start of a season, and scored in the international break as well. Running, twisting, turning, beating his man, getting into dangerous positions over and over again.
He is doing fine. Sometimes you have games where a lot of chances fail to be converted. There's nothing new in that. You can find games like that throughout any goalscorer's career.