Jeff Johnson, author of StopTheMadness:

…DuckDuckGo still uses JavaScript to intercept your link clicks, and there's no good reason for it. One consequence of this clickjacking is that your Safari browsing history gets messed up.

…To stop DuckDuckGo clickjacking, install StopTheMadness, create custom website options for duckduckgo.com, and then enable the “All mouse clicks” option.

I find myself caught by this at least once a week. JavaScript remains a menace.