Question

Why did members of 3 estate walked out of the assembly in protest

Answer 1

The members of the Third Estate were arguing about the process for the Estates-General. The king's ministers had intended that the three estates meet and vote separately, with each estate having one vote.
Instead, the Third Estate insisted that the three estates meet as one body, and that voting be by head so that each person have one vote (the Third Estate had as many members as the other two estates combined).
When the deadlock over procedure could not be resolved, the members of the Third Estate declared themselves to be the only legitimate representative body, and renamed themselves the "National Assembly". 

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Answer 2

1)voting in estate general in the past had been conducted according to the principle that each estates had one vote. louisXVI was determined to continue the same pratice

2) but the members of the third estate demanded that voting now be conducted by the assembly as a whole, where each member would have one vote.

3) this was one of the democratic principles of rousseau 's the social contract.

4) the king rejectected the proposal , and the members of the third estate walked out of the assembly in protest