Your form breaks down a little, but the first 2 reps were actually a little less strict than the 3rd, IMO,
If you look back at the video, watch your head relative to the white portion of the bike (where the girl is initially). The first 2 reps your head completely covers the top white portion of the bike, and on the 3rd rep you are not coming too far forward anymore. It looks like your hips are coming up just a little too fast.
It may help to point your toes out a little more and do the same with your knees.