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Because Tapu Bulu is an asshole. The locals couldn't believe an asshole god would be appointed, so there were legends created about a former Ula'ula tapu, a water-based tapu named Tapu Lana. Tapu Lana was a kind and gentle spirit until Tapu Bulu overthrew and killed her at the peak of the mountain. The mountain was then named Lanakilla to 'honour' Tapu Bulu's reign in the hopes that he would be appeased and be less of an asshole.
I pulled that out of my ass there and then, much like the islanders did Tapu Lana, who never actually existed at all, they just wanted reassurance that assholes can't be given power without stealing it
