So far as I know there's been no big news that should've caused everyone to revise their opinions about the whole science establishment. The numbers of people who "disagree" with the idea that scientists are trustworthy seems little changed.
Seems to me that this could be reflecting this year's mood being one in which people are less inclined to "strongly agree" with things in general, rather than any specific opinion about scientists. Maybe they should add some kind of control question to test that.