Hawaiians make up <10% of the state population.  If you get a representative sample, in the 832 people surveyed for the poll there would be 80 or so Hawaiians; while 800 is enough for a statewide survey, 80 leaves you with a huge margin of error.  

Only 32% were surveyed by cell phone and I'd wager Hawaiians would be both less likely to have a landline and less likely to respond to a poll.  Plus, there are many Hawaiians who are hardcore evangelicals.  Add those all up and it's easy to get a sample that's not representative.  

Same reason Hispanics are at 63% when Trump is getting <20% of the Hispanic vote nationwide.  Low sampling numbers, plus probably combines older Puerto Ricans (more likely to be conservative) with more recent arrivals (more likely to be liberal).