Safari 7.1.2 -duckduckgo missing from Dropdown?

Recently, I noticed duckduckgo was missing from my Right-Click option to search using it. Instead google was there. So I went to Preferences, General to select it from the drop down.

It is not in the drop-down. Only the 3: google, yahoo, bing.

It was there before, now just gone.

I'm running Mavericks 10.9.5, and it's Safari 7.1.3.

On my macbook, which is still Safari 7.1.2 (I know time to update which I was about to do on both when I discovered this!)

How do I get the "duckduckgo" back into the "Default Search Engine" List?

I've searched the forums, but just can't find this issue.

Please help!