The weirdest sentence in the PRRI report that this article analyzed was, "Close to
9-in-10 (86%) LGBT people support allowing gay and lesbian couples to legally marry, while
11% are opposed."
The only explanation I can think of is that the 11% were opposed to allowing anybody to legally marry. If so, it's likely that there is a similar effect in the 95% of those surveyed who were not gay or lesbian. In that case, more people support marriage equality (allowing everybody or nobody to marry) vs. allowing gay and lesbian couples to marry. In other words, a higher percentage of people support marriage equality than the initial report indicates, which is encouraging, but a significant portion of the respondents don't think marriage is good for society.