I did think that since it's a standard basis for arguing against the 2nd. The only issue with the language is people ignoring the separation between the justification of the right and the right itself. It doesn't matter what they said the right was for, whether it be for self defense or a militia for defense of the nation. The right stands on its own as the right to keep and bear arms.
It's a deliberate misinterpretation.
That's difficult to say because they don't say what the question is. It could be as simple as "do you think common sense laws to keep guns out of the hands of criminals/children/immigrants are a good idea" or it could be even more weasely. Without knowing the actual question the survey results are meaningless.