Translation:He parks the car and I drive the car.
I can think of two possible explanations:
1) The computer made a mistake when comparing two strings
2) You made a mistake when writing your answer, or in reading it back.
As Sentence Discussions are a user-to-user forum, and users have no way of knowing what you actually submitted, and as none of the thousands of other users who have done this exercise have reported a problem with the computer having any difficulty comparing two strings in this exercise, the 2nd explanation sounds like the most likely explanation.