Google has confirmed in the Google Web Search Help forums that they are running a test where the search results page shows no knowledge panel. The knowledge panel on desktop typically shows up on the right of the page when there is a match for a name, brand, company, facts, etc. Andy from Google confirmed Google is testing not showing it to some searchers.
Andy B. from Google wrote "want to confirm that what you are seeing is an experiment. We’re always testing new ways to improve the Search experience for users, and one of the ways we achieve this is by experimenting with different methods." He added that if you do not like it "please leave in-product feedback at the bottom of your Search results page to share your thoughts."
Here is a screen shot of the experiment where Google does not show the knowledge panel:
Here is what I see, with the knowledge panel:
Forum discussion at Google Web Search Help.
