I agree. Maybe many respondents confused “libertarian” with “liberal.”
This is quite an exhaustive poll — recommend everyone go to the link and read the actual article.
“In June, Rasmussen Reports asked 15,000 Likely Voters if they were fiscally conservative, moderate, or liberal and if they were socially conservative, moderate, or liberal. This created a total of 16 possible combinations (not sure was a fourth option for both questions). However, 87% of voters fit into one of seven combinations. Libertarians, defined as fiscally conservative and socially liberal, are the smallest of these seven combinations. “