A plurality of Puerto Ricans don't want to be a state.
In 1998, when they asked the question with 4 options at the same time with a None of the above, the last won.
The 2012 vote was nonsense. They rigged it based on what the knew of the demographics. Since most people wanted a change in status, but didn't want statehood, they forced them to agree to some change in status by asking first if they wanted one. A huge number of people must have known what came next, so they voted no, but yes still won at 54%.
Then they asked if they wanted US statehood or, I think, Free association, but they called it E.L.A. Soberano, which referred to a specific movement. That left anyone who didn't want the latter force with picking U.S. statehood, and 24% of them still left it blank.
If they had left the "Other" option on the latter ballot, it's very likely to still have won. I'm not sure what "other" would mean, but I think they need to figure that out rather than force the people there to become something most of them don't want.