People do not have to be consistent. Three follow up study could try to determine how they identify themselves later and what kind of sex life these people have. The study is probably underpowered to detect any mental issue if any exists whatsoever.

Whether you're sexually attracted to men or women is entirely subjective and not mutually exclusive. You can have a preference, which is most likely what you identify as, but you won't find the other sex entirely sexually unattractive as a result of that.