because they saw the beast and he wants to hunt it down and thought Ralph said that his hunters were not hunters
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That he thinks his hunters are incompetent at what they do and that Ralph is not a proper chief because he talks like piggy.
revote for chief
Jack made his announced his own tribe in Chapter 8: Gift for the Darkness. He said "I'm going off by myself. He can catch his own pigs. Anyone who wants to hunt when I do can com too." In the end of he chapter Jack tries to show his power and steal Piggys specs.
The first thing that the boys decide to do, after Jack has left, is to follow Piggy's suggestion to light a fire near to the shelters since the presence of the 'beast' is preventing them from relighting the fire on the mountain top.
In Chapter 8, Jack asks everyone to vote for him as chief. When no one votes for him, he gets embarrassed and he starts to cry.