Reldresal said that the heir to the throne wasn't sure about which party he belonged to.Why?

Are you sure this is in chapter 4?

Yes, this question is in chapter 4 of part 1

Redressal told Gulliver that the heir to the throne was not sure about which party he belonged to because he was little bit inclined towards high heels. so, he wore low heel in one foot and high heel in another, that caused him to limp while walking.