I have no idea how the spectrum of political views can be divided into two discrete categories. But a plausible reason one could be more subject to "misperceptions" (hopefully people see how scary it is to have that be the way that a political view is characterized) is that some people are more free thinking than others and don't just accept orthodoxy as fact.

I'm not trying to say that my alternative hypothesis would follow some kind of party line, just hint at how there could be many interpretations of this study, if you don't already reject its entire premise of trying to bucket people and then find intellectual differences between then.

Personally, I found the "high authority vs low authority" juxtaposition by Altemeyer better for understanding these dynamics.

https://theauthoritarians.org/options-for-getting-the-book/